I have a WD 1tb purple drive (WD10PURX) that I recently purchased, but found that I can't use. It's brand new and unopened. $50 plus actual mailing cost.
I bought a Dell system (Dell Outlet Optiplex 7020 Small Form Factor) with a "Small Form Factor" case - I didn't realize it was going to be as small as it is, and I bought the purple drive intending to add it to the case. But the case is too small to accommodate a second drive.