All those regs are going to vary by state, county and city... I think?
And don't forget about the sales tax stuff. I have NO clue on that.
Not on the same level, at all, but I was in charge of Field Day Concessions one year... had X amount to spend and I was expected to double it. Traditionally we had sno cones (had the machine) or popsicles... every child got one free... and then we had some kind of hearty thing... hot dogs, nachos, pizza... depending on year... and then sodas/water... and then assorted candies.
I did a LOT of comparison shopping, online and in store, looked at ads, etc. In the end I found that Kroger/etc on sale price for sodas was cheaper than Sams Clubs big case price... I could buy them for 25c or less, and sell them for 50c and tadaa double. I think one week I hit Kroger for Coke Products and one week hit Albertsons for Pepsi products... or was it the other way around? If I'd bought the same 12oz cans at Sams I think they ended up being 30+ cent a piece, so to double I'd have had to charge at least 60c... an off number... and I had no desire to be counting pennies so I stuck with 25c increments.
I did that with everything we sold... each candy... some things, like gum... big bucket (sams club) was X dollars and each piece ended up being like 2.5 cents... so I made it 5 pieces for 25c... my cost was 12.5 doubled the money.
Some candies were like the gum, others were more like the sodas 20-25c each sell for 50, some were 35-45c and sold for 1.00...
I ended up going with hot dogs and nachos when I was in charge. Added up the cost of chips/number servings to find the per serving cost... and then the same for cheese... and sold to get double that back. And the same with hot dogs... WAY easier to calculate since it's a bun, a dog... not X ounces... also with the hot dogs you can get a batch ready and wrap them in foil and be able to hand them out super fast when the rush hits... cannot do that with nachos, they get soggy, but they're a big hit. Don't forget the peppers.
Those big ol' pickles are always a hit, and are easy. But again I found store was better priced than the big club... in this case it was the Walmart neighborhood market that had jugs of pickles that were less per pickle than Sams... odd since they're both owned by the same company, but I'll take it! Think pickles ended up being 20c or so and sold for 50c and WE SOLD OUT... had to go get more and then sold out of those... BIG hit. And again, easy. Jug, tongs, napkins.
I made sure that every item was doubling it's money on the individual level... made it pretty easy to make sure I doubled my overall.
I might have those old charts stashed somewhere... maybe in my yahoo files... of course they're outdated by a year or so... but if you'd like them I can email them to you... might make it clearer what the devil I'm talking about. Lemme go snoop and I'll repost/edit if I find them... then you can PM me with your email if you want a copy.
Edit... yup sure enough found them stashed in my PTA Files... aren't I clever attaching them to an email, send it to myself, and then delete from my puter... still have them, but not taking up space on my hard drive... tee hee. Anywho, they're here if you want them, Field Day Price Comparisons, Field Day Shopping List, Field Day Tables, Field Day Tables II are the ones you might be able to use... flyer, volunteer, donation requests, etc was useful for me but prolly not for you, but I can easily forward this email with attachments from myself to myself over to you... lemme know if you'd like me to.