As one of its daily deals, A4C offers the refurbished Amazon Kindle WiFi 6" eBook Reader in Graphite, model no. B0051QVESA, for $49.95 with free shipping. That's the lowest total price we could find for a refurbished unit by $9, although we saw it for $10 less in November. It measures 0.3"-thick and weighs in at just under 9 oz. It features a 6" 600x800 E Ink screen, 2GB internal storage, 802.11n wireless, PDF support, and more. Deal ends January 31.
A 90-day A4C warranty applies.
There's a less expensive way, and then there's the way that works for you. The two may not be the same.