https://www.reddit.com/r/nova/comments/1icjcs8/cd_cellar_in_falls_church_great_place_for_music/

They have a million clearance classical CDs that go for $1.99 each ($3.99 for double except some Bach cantatas are priced single, for three CDs!) but in bulk you can get them for 30/$35, many on good smaller British and European labels that go for $15-20 each on Amazon. I’ve never bought more than that but every time I go I barely scratch the surface, looking through one box out of like a dozen under the racks. I could spend hundreds there just on clearance, and they have regular CDs, too.