I got mine off ebay.  0.99 cents plus $10 shipping
you can also goto http://monoprice.com
Part number # ADIDE2CF adapter
This particular reader replaces a IDE hard drive in a pc.
You plug this device right in the IDE slot of the mother board. ** No cables. **
They also have many other types. Just type "cf reader" in the search box.
I have been using this same adpater in three different m0n0wall
routers for the last 6 months. No issues to report.

http://mach5products.com/ has a nice looking 5-1/4 drive bay reader
I'd like to have...but I'm too cheap right now.

- Don