What's a fair price iPad Air 128 unlocked LTE GSM

[dj2big]

Just received my iPad pro and want to sell my iPad Air trying to figure out what would be a fair price to sell on Craigslist.
It is in perfect condition 128 gig silver and LTE unlocked for use on any GSM network

 

[Closingracer]

$500 perhaps more? I generally check Craigslist prices and slightly undercut those prices. At least the ones that seem legit.