Sams has one that includes sides (solid though I think) and a front half side. Then all you need is the screened sides for when it's warmer out and you should be set.
I think of vending pretty much as the same setup as a comp. Food prep area, cleaning area (3 basins), and a serving table. But then again...I haven't really done any vending...yet!
Neil -- "Easy Bake Master"
NB Bandera [gone to heaven...conveniently located in Long Island, NY]
WSM A, WSM B, UDS, Easy Bake Oven
Pork Pistols BBQ
MOINK...It's what's for linner.