Really depends on the city. NYC can be insanely expensive. In Manhattan a "cheap" beer (Miller Lite) is $8. Any half way decent dinner is going to run $30-40 per person. In the SE US, you can get beers as cheap as $2 or $3 on happy hour, or $4 regular, and a good meal for $20 per person.
When I'm traveling I try to accept things are going to cost more than at home, it's all relative.