I saw a place with $0.99 burgers. All extras, like bacon etc. INCLUDING CHEESE were an additional $0.60 each.
When it comes to extras you can really get screwed. I once ordered a sausage pizza with mushrooms and onions added at $1.25 each. When the pizza came it had about two quarter- sized mushrooms and six onion rings averaging half dollar size. I can buy 8 ounces of mushrooms for $0.99 and onions at $0.39 a pound. Surprisingly, the most expensive item, sausage, was more than generous. When I complained, the extras were taken off the bill.