A piece 10 inches around will set you back about fifty cents. By the way, there is a Chinese grocery store in the basement near the south end. You can't walk by with kids without stopping. This is strictly a daytime town and by 5 or 6 p.m. all of the shops will be closed. There are supermarkets in many of the new shopping centers.
Local brands are cheap, but imports can be expensive.
You will pay a deposit on beer bottles and even some wine and liquor bottles. Some Food Notes coffee, peanut butter, candy, donuts, water, paprika. Money Hungary is a cash society. Checks are unknown and you cannot count on credit cards being accepted outside of tourist areas. Machines are easy to find and you get by far the best exchange rates.