They are a $1400-1500 unit new. If it really is new I would smell a rat in there somewhere till I put my eyeballs on it. $700 is what you would pay for a 10 yr old one well cared for. The 210 comes in several different config also. They run up to almost $2K in the multi-process models. Plan on a minimum 220V 30A circuit for good performance. On 110V you will probably be disappointed unless working all light gauge stuff. I believe the straight MIG will run SMAW also probably around 90A output max.
Ron