Costs
How we cost a vendor's menu
A vendor usually knows what they charge. Fewer know, item by item, what it actually costs them to make it, and how that margin moves when the wholesale price of corn shifts a nickel or California bans the cup they've always used. This page explains the method vendo uses to get from a receipt to an honest per-item cost of goods sold, or COGS. It is not a price list. It is the discipline behind one.
DRAFT The method below is grounded in exactly one real case, a solo elotero cart's cost and sourcing analysis for a single private booking. It is not yet checked against a second or third vendor. Treat the method as sound and the specific numbers as illustrative of that one cart, not as a general price guide for every cart.
The tagging discipline
Every number is marked SOURCED, DERIVED, or ESTIMATE
The single rule that makes a cost analysis trustworthy is refusing to invent a precise-looking number where no real source exists. Our case study tags every dollar figure one of three ways, and a vendor reading it can tell at a glance how much to trust each line.
SOURCED
A real, citable price or fee pulled from a supplier page, a USDA market report, or a government fee schedule, with the URL given. In the case study, sourced figures include USDA AMS terminal market prices for corn and limes, and case prices from WebstaurantStore and MexMax.
DERIVED
Arithmetic performed on a sourced number, like dividing a case price by the units in the case to get a per-ear or per-ounce cost. Derived numbers inherit the reliability of the sourced figure they come from.
ESTIMATE
No solid public source was found. What's given instead is a best-reasoned figure with the reasoning shown, treated as accurate to roughly plus or minus 30 percent. Where a supplier hides pricing behind a membership login or a delivery-location cookie, an estimate says so rather than guessing silently.
The point is not that estimates are bad. It's that a vendor, or anyone reading the analysis, should always be able to tell which kind of number they're looking at, because a margin built on three estimates stacked together deserves a different level of confidence than one built on a single sourced case price.
Where a cart actually buys
The three-channel wholesale pattern
A solo mobile cart in California typically isn't loyal to one distributor. The case study found a cart-style vendor running three separate buying channels, each for a different reason, and costing a menu accurately means pricing all three rather than assuming one covers everything.
Produce terminal / wholesale row
Places like the LA Wholesale Produce Market or Fresno-area produce houses. Fresh corn, limes, jicama, cucumber. Cheapest per unit, cash, early morning, no membership needed for cash-and-carry rows.
General foodservice wholesaler
Restaurant Depot, Smart & Final Extra, Costco Business Center. Mayo, cotija, butter, cups, spoons, napkins, gloves, soda, bagged chips, bagged ice. One-stop with case pricing, though Restaurant Depot's pricing is member-only and not published, and Costco Business Center hides prices behind a delivery-location cookie.
Latino-specialty wholesaler
MexMax, Sabores de Mexico, La Guacamaya distributors, local dulcerias mayoristas. Chamoy, Tajín, Valentina, Lucas, Mexican candy, cacahuates japoneses, snow-cone syrup. These SKUs aren't reliably stocked at Restaurant Depot or Costco in case quantity. MexMax in particular is unusual for publishing case prices without a login.
SOURCING NOTE Every business named on this page is listed only as a source for our own research into how a cart-style vendor sources goods. This is not a recommendation, and vendo has no affiliation with any wholesaler, market, or business named here.
The method, made concrete
Two line items from the case, worked through
Two illustrative examples from the case study, chosen because each shows how a tag changes the confidence you can place in a number.
Corn, per ear
SOURCED white corn out of the Brentwood district ran $26 to $28 a carton (48 ears) at the LA Terminal Market on the date checked, which DERIVES to about $0.54 to $0.58 per ear. Because early October sits at the tail of California's sweet corn season, supply shifts toward Coachella or Imperial or imported corn, so the case study budgeted a 10 to 25 percent seasonal markup, an ESTIMATE of $0.65 to $0.75 per ear for an early October date. Three tags, three levels of confidence, on one ingredient.
Cotija, per pound
This one shows why the source matters as much as the number. A shipped, refrigerated e-commerce case price came back SOURCED at $10.54 a pound, roughly double what the same cotija costs walking into a Restaurant Depot or Costco Business Center in Southern California, also SOURCED, at $4.28 to $5.30 a pound. Using the e-commerce number would have materially overstated the vendor's cost. The fix wasn't a better estimate, it was recognizing that two SOURCED numbers can describe two different buying channels, and using the wrong one changes the answer by 2x.
The same discipline runs through every item on a cart's menu. A build-up for one esquite in the case study, for example, priced corn kernels, mayonnaise, cotija, butter, chile powder, lime, and the cup itself as separate tagged lines, then summed them to a total cost of goods sold that could be checked against the vendor's actual retail price.
A cost that's easy to miss
The packaging gotcha: California's foam ban
Costing a menu from ingredients alone misses the kind of cost that only shows up when you check a state regulation against a supplier's fine print. The case study found exactly that with cups.
The classic white foam cup that an esquite has traditionally been served in is SOURCED at roughly $0.054 to $0.076 per cup in case quantity, cheap. But every foam cup listing the case study checked carried a shipping restriction: it cannot ship to California, among a few other states. California's expanded-polystyrene foodware restrictions mean the foam cup isn't a legal option for a permitted California vendor. The real substitute is a polypropylene or paper hot-food cup with a lid, an ESTIMATE of $0.13 to $0.22 per unit, roughly 2.3 times the foam-cup cost, once spoon and napkin are added in. That difference doesn't show up if you price "a cup" in the abstract. It only shows up if you check what a vendor in this state is actually allowed to buy.
This is the kind of finding the tagging discipline exists to catch: a real, quantifiable cost increase driven by regulation rather than ingredient price, that a vendor pricing from memory or from an out-of-state supplier's sticker price would never see coming.
See Wholesale for more on the three buying channels, and Pricing for how a costed menu turns into a pricing conversation.