Record Recording

Need help finding a recording device to record lectures in class?

I need help looking for something to record lectures.I want something digital and that can possibly last an entire semester (not important)
and i want to be able to listen to one day or the other without having to fastforward.whats the cheapest and best and were can i find it?

Digital voice recorders are available everywhere now:

http://www.walmart.com/search/search-ng.do?search_constraint=0&ic=48_0&search_query=digital+voice+recorder&Find.x=11&Find.y=8

Walmart – save money, live better.

The Strokes 2010 Recording for next album PART 1