Harmony Central is a very good place! They also have instruments and quipments review with price on them. Are you attending schoolmusic? You may try your school's bulliten. If you are attending a mucis school, the board definitely has things as music trading are on it. Good lick!
Oh, sorry! I wrote to quick, and misspelled some words. Music school, not schoolmusic. Bulliten board, not bulliten. Never mind!