The majority of the music I buy is second hand. There are a bunch of great used CD/record stores in New Jersey. I'd rather wait to find a cheaper copy than buy something new. I pretty much listen to music on my iPod, so once I rip the album it gets put away on my CD shelves. It takes up space, but I get pretty dorky and like looking at my collection. My LPs are all in crates, in case you were wondering.
As far as buying new releases, I'll pick them up at Best Buy or Target if they are on sale. Century Media usually has great sales, and I'll do a mass purchase from them to catch up on my metal releases.