Refurbished tablets aren't for everyone but British retailer, Argos, has a great deal currently going down on a refurbed Nexus 9. If you're willing, you can snag a 16GB version in black for just £159.99 on the company's eBay store with the added bonus of a full 12-month warranty.
The usual caveats apply but at this price you're almost certainly better off taking a punt on this over a pre-owned tablet, for example. The backing of a major retailer and a full year warranty certainly sweetens the deal. As does free shipping.
There's no telling how many there will be so if you're interested hit the link below and get it while it's hot.