I’m selling my iPad Air 2 which looks brand new (no dents, no scratches, no damage what so ever) for $180 OBO. It’s an A1566 model, 16GB Wifi Silver. You can find the specs here: https://support.apple.com/kb/sp708?locale=en_US
I loved how light and thin this iPad was. I used it mainly for storing textbook pdfs instead of carrying heavy books to school. The screen is just the right size for reading books. The performance is still fast and great, no OS/app crashes. The only reason I’m selling this iPad is that I want to upgrade to a newer model that is pen compatible.
You can also take the smart case for free. It’s not in the best condition (a few minor cracks + stains on the inside of the cover), but it’s been doing the job just fine.