I would highly recommend the H2 Zoom. You can get one for around $100 if you look carefully (I know several people who bought them off eBay with no trouble). That might be a bit more expensive than what you’re thinking, but the recording quality is excellent, and it’s very easy to use. Plus, you can listen back to what you just recorded from the device, and it’s also easy to upload the recordings to a computer. I know many other musicians who use them for everything from band rehearsals to practicing to live recitals. It’s really an investment, and can be used for a lot of things. If you can spare the extra $, it’s totally worth it.