Believe it or not, the Sansa Fuze, an MP3 player, has an excellent built-in voice recorder function. Unfortunately, the Version 2 units (all you can get now) have a hardware design flaw that allows a very low level ticking to get into the audio. It records 24kHz 16bit mono wave files. The crappy little mic picks up amazing well. When I was in law school, I used a Marantz cassette with an external boundary mic, with the professors' permission. The intelligibility was excellent.
The reason I mention the Sansa Fuze is that there is a possibility that not all of the units have the ticking problem. Some users on another board have suggested that the Version 1 units don't have the problem. If you can find one without the ticking, it will cost you about $50. It is VERY small and unobtrusive. I'd bet you'd be hard pressed to tell the difference in the recording quality between the Fuze and an M10.
If you have a portable MP3 player, check to see if it has a voice-record function on it. If it does, try it. You might be very surprised.