If you're just a hobbyist, though, the DSO Nano v2 is actually a great little device:
http://www.seeedstudio.com/depot/dso-nano-v2-p-681.html?cPat...
It also has a newer replacement which is significantly more useful, the DSO Quad:
http://www.seeedstudio.com/depot/preorder-dso-quad-4-channel...
I was given the Nano v2 as a present, and for quickie low-frequency testing, it's fantastic.