Most, but by no means all, things are cheap in Beijing. Some examples:
Beef and mushrooms over rice, served in a cute wooden bucket, 15 RMB ($2.25)
Small caffè latte, 30 RMB ($4.50).
Rather large whole fish, supposedly live from a tank, cooked in a spicy sauce, 45 RMB ($6.50). Was shared by four people.
Cocktail from a bar that white people like, 70 RMB ($10)