Seems a cracking price for what you get - same price as a hob-top and much more convenient. You can even set it to keep your food warm for up to 24h after cooking.
This is the 'used very good' price in Amazon Warehouse so I'm not sure how to link to it. It's highly unlikely to have been used and should be either a damaged box or customer return.
Seems to be more than one of these available and reviews are decent.