I was a BILLBOARD Magazine Club DJ/Reporter for 18 years. All the labels used to send me promo copies of everything.
I have a box of around 200 CDs. Probably a little more. These date from the early 90s until the early 2000s.
Most are promo copies, most never played. Singles and albums from big and small recording artists.
For resellers--
The retail value range of these is $1-20 each. There are many in here in the $10-20 range.