Prices vary, but of course you expect that. You can eat lunch for 5-20 bz at any number of restaurants and dinner for 10-40 bz. Beers average 2.50 bz-4 at bars and restaurants. I know that you already know this, but the exchange rate is 2 bz = 1 U.S.
Cheap places are: (5-10 bz) Food vendors on the street, Chan's fast food, the China Reataurant (fried chicken & french fries for $5 bz) Martinez fast foods
Moderate places are: (10-20 bz.) The Sandbox, Jolly Rogers's grill, Vespucci's Table, Oceanside, Poor Man's Grill
Expensive: (over 20 bz per person for dinner)
Cocoplum Gardens, Habanero's, Rasta Pasta. The prices might be higher, but the food is incredible at these 3 places, they out-do any place in San Pedro (for much less money than you would expect)
There are many more places than I mentioned. Food is 1/2 as exensive here as it is in San Pedro, in fact, just about everything is.