I give my CD-Rs away - for a £5 donation to charity. They're clearly marked as being promo CDs and don't pretend to be posh professionally manufactured product, being as they're in a flimsy PVC sleeve with an A4 insert. But they do have contact details (well, as a promo, they would, wouldn't they?)

I reckon to have sold, er, given away a couple of hundred over the last few years. I've had to replace two.