http://www.zzounds.com/item--MDOMOBILEPRE
A small collection here. I know some on here have had good luck with the M Audio versions. I use the Lexicon Omega which works very nicely also. I have also used the Behringer, wasn't real impressed with that one but for your application may work just fine. Although Z sounds is fine, I'm not recommending the store, it was just a site that showed a few in one place, I thought it might be a good place to start your research. You get the fun of looking for the best deal. You could google USB interface also. Happy reading
As has already been suggested, Audacity is a good free program to record onto, easy to use.