I found a hard case that works well enough and thought I'd share. It is intended for a GP2X. It is a bit thicker than ideal but could be considered a bonus to hold other things (SD cards, whatnot). Here's a link:

http://www.play-asia.com/paOS-13-71-...n-70-11n4.html
(I do not vouch for the site--link is for demonstration only)

My significant other has a GP2X and this is how I discovered it.