"Commissary, again, depends. Some stuff is way cheap, some is "meh." On the MCAS Miramar they hit you with a 5% "fee." Not sure what it's for."
It's called an upcharge. Supposedly, the commissaries price everything at their cost plus a 5% upcharge added on at the cash register, which is supposed to cover the operating expenses of the commissary. The other thing is the carry-out "boys." Customers are expected to use the carry-out service to move their purchases to their car, and render a tip. I don't know who the commissary carry-out guys are - wounded war vet retirees or something like that? I have been in various commissaries but never bought anything there, and have always heard that the prices aren't much different than at stores on the outside, except for the absence of state sales tax on taxable items. Like the BX, it is a more valuable service at remote bases and those bases outside the USA. One thing which carries a high penalty is a military person or his dependents caught letting anyone else use their identification to shop at a commissary or BX/PX. That is an offense which is taken very seriously.