As much as it pains me, I'm going to sell my DCM8. I've heard these are pretty hard to find, and I'd like to offer mine on cm.org for a decent price before putting it up on eBay. I'll sell it for $400 (including shipping). That's a pretty good deal as far as I can tell.
The DCM8 is a great drum machine. It sounds awesome, and it's fun to play with. It's definitely has quirks, but hopefully you like quirky music-making machines. Mine is in great shape. I bought it brand new a couple years ago for I think around $550. Included in this offer is the drum machine, the original power adapter, and the manual. Let me know if you're interested.
Old eBay listing
Old Perfect Circuit store page (out of stock)
My DCM8, in action:
Some how-to demonstrations: