I have a friend who wants an mp3 player for audiobooks and wants to know if there is something good out there that doesn't cost too much. I know nothing about audiobooks and what format they are commonly downloaded as. However, I do see many mp3 players on ebay for under $50 that have more than 2 GBs of memory and seem to support a variety of formats as well as mp3. What other things are there to consider? Do some players not fast forward or skip around as well as others?