Hi Canuker...as far as the pizza price goes you have to remember that cheese is crazy expensive down here and so is the toppings thats why pizza is not a cheap meal option here.
Go to Celi's or Ali Baba's order one of the rotisserie chickens and a side will make a great meal. Waraguma I can't even eat a full burrito. Hidden Treasures great food good prices, Mickeys also very affordable and good food.
I agree with Lan if you want to drink cheap it has to be local rum and local beer. Everything else is imported and costs an arm and a leg.
Enjoy the rest of your trip!!