You can find the CDs new on Amazon, but used copies are much cheaper on Discogs, even when you factor in shipping. I picked up near-mint copies for around $3-4/disc (not including shipping).
Interestingly, when I had these in my collection prior to the purge, I didn't rip them in their entirety to iTunes—something I now regret (and has been corrected) that I've gotten them back in my collection.