The refurbished K1 has replaceable battery, sd card slot, and carries a full one year warranty. You have 30 days to return if you do not like it, pay only shipping. NO restocking fee.
Oh,..........and yes you can borrow books (mobipocket) from the library also, using the kindlefix script.
Did I mention it was $149 with free shipping? and no tax?
http://www.amazon.com/gp/offer-listi...on=refurbished