So, I like to buy CDs, but at stores, Cds are often 10 to 15 dollars. So I decided to check Amazon to see if buying disks online was cheaper(i am referring to an actual cd, not digital downloads). Now Amazons CDs, I found out, typically are around 10+ dollars. however, if you go down to New and Used sellers, you can buy the Same Cd for usually five dollars or less, even as low as a few cents. eBay's sellers have similar prices also. how is it that sellers can sell these things, DVDs, CDs, Etc. so much cheaper?