Cowboom offers the used HTC Google Nexus 9 16GB 8.9" WiFi Android Tablet in Indigo Black, model no. 99HZF003-00, for $279.99. Coupon code "Nexus8615" cuts the price to $179.99. With free shipping, that's $29 below our June mention of a used tablet and the lowest total price we've seen. (It's also $165 below the cost of a new unit.) It features an 8.9" 1536x2048 IPS LCD touchscreen, 64-bit NVIDIA Tegra K1 2.3GHz processor, 2GB RAM, 16GB flash memory, 8-megapixel rear camera, 1.6-megapixel front camera, Bluetooth 4.1, 802.11ac wireless, and Google Android 5.0 OS (Lollipop).
Note that no warranty information is provided.