As one of its daily deals, CowBoom offers the used Amazon Kindle Touch WiFi E-Ink 6" eBook Reader
, model no. D01200, for $39.99
for shipping. That's $44 under the lowest total price we could find for one elsewhere, although we saw it for $5 less in yesterday's mention (since expired). It measures 0.34"-thick, features a 6" 600x800 e-ink display, and weighs in at just under 9 oz. It also sports 4GB internal storage, 802.11n wireless, X-Ray (which downloads Wikipedia information along with your books), PDF support, and more. Deal ends today.
Note that no warranty is available. This used unit may be missing accessories and have scuffs, blemishes, or scratches.