Amazon offers its used Amazon Kindle Oasis WiFi E-Reader with Special Offers in Black for $148.74 with free shipping. That's $151 under our January mention of a new unit (although that included free 3G) and $211 less than the lowest price we could find for a new one today. It features a 6" display, 300 ppi high-resolution display, adaptive front light, and leather charging cover.

Note: It includes a 1-year Amazon warranty.