http://www.musiciansfriend.com/produ...dio?sku=242060
Here's a digital 4-track. I know there are smaller cheaper ones, but I'm not finding much on musician's friend.
http://www.musiciansfriend.com/produ...dio?sku=241106
This is cheaper than the one above and it's an 8 track, so you'd have lots of space. These have a good rep - I was actually going to buy one before I decided on my 16 track. Plus it has a hard drive so you don't have to worry about flash cards.