lizzard
once in belize you will want to get on a flight to a town called San Pedro, on an island called Ambergris Caye. this is where tropic air is based, and maya also bases some pilots and aircraft here.
on the island there are a few cheaper hotels not advertised on the internet. most you don't need to book, just show up and as k for a room.
Ruby's hotel is right on the beach and has single rooms from $20US +
Hotel Del Rio is also on the beach and i think runs for $35US
Martha's hotel is not on the beach, but has rooms for $20US
there are a couple more cheap ones, but can't think of them off the top of my head.
food is reasonable, you can get a nice meal for under $10US at a restaurant. or you could eat off the food vendors for like $2US. booze is cheap, you can buy a litre of rum for $7US, and beers are about $2US at the bar.
hope this helps. drop me a PM if you decide to come down for sure and i can give you more info about the island and where to go for fun.