I like my Paperwhite. It doesn't mess with my eyes before bed.
LOTS of used Kindle ebook readers on Ebay though some of the sellers want more than new prices. I just picked up a third generation Paperwhite, the current model, for $70 with shipping. Listed as refurbished so probably has the screen replaced. A wi-fi only version with 4 GB and the backlight. It should also have the 300 DPI screen. Not listed whether or not it has special offers and you cannot tell visually if the pictures were taken when it is not registered so far as I know. IMO too good a buy to pass up for a Kindle with 4GB and backlight now that wi-fi hot spots are so common. The dual communication capable ones with wi-fi and 3G cost so much more when new any more that they are hard to find used.
To me a used Paperwhite is currently the best buy in a Kindle book reader as it has the back lighted eink screen.