I have ordered 100 cd lots off from Amazon. They are just the discs without the case. I would say 97 percent of the discs are good, and I have been able to rip them to my hard drive. They cost 25 bucks or less.
They thing is these lots contain everything, classical, broadway shows, jazz, soundtracks, pop, rock, country, holiday, world, and children's music. I'm pretty eclectic in my tastes so I find lots of stuff I like. The cost is pretty minimal considering, and I every time I have bought them I have found my share of music that pays for itself.
@SoccerFan, @OverTheHill I have a semi-pro music editing app called "GoldWave" www.goldwave.com - the basic is free but I paid something like £25 for life. In its simplest form it's like using a virtual tape~recorder: I get all my music nowadays (free) from Spotify's desktop version or YouTube - my everyday playlist currently stands at 9,915 tracks.
I do a 4hr stint each week in our local Oxfam Book & Music shop, up in the Vinyl, CD, DVD section. Loads of cheap CD's, mostly £1.99. Got myself some great stuff there.
A photo below of "Les Dawson's" knees as he sits amid the stock.