Mr. Cheapo CD & Record Exchange
46 Jericho Tpke. (in the Mayfair Shopping Center) Commack, NY 631-543-8686
A sign hanging in the Commack location says, "Everything in the store is for sale." There's a lot here. It's cramped and packed with everything - T-shirts, posters, stickers, vinyl both used and new (an unopened original pressing of John Cougar's "American Fool" album was $7.99), CDs and tapes.
Another location in Mineola.