Sold a 12-15 year old one in May for 750 asking price after I had hands on a new one, could likely get 1000 now. My wife wanted a new one in the house. In some way I regret selling the old one. I have a picture of the old one in work, gone now, like a old happy dog passed away. I'm sure it makes the new owner happy. Back to you. These are very durable, one check is to lay a 18" long or so wood ruler on the two cast iron grates. If you can't see space between the ruler and grate the stove has not been severely overfired and that is good. Warped grates may make shaking difficult since the grates touch eachother during shaking. You can also check the baffle above the firebox. If it feels warped, it was overfired. Other than that a 2 year old stove will not have a lot of firebox steel erosion/corrosion. Check the metal brick retainer at the botton of the door. In old ones the retainer will be eroded and you should not have a lot of erosion. This is one way of telling how many seasons it was used.
It would be interesting to ask why someone is selling such a magnificent beast at this point when coal is so popular. If everything is good, 1200 seems very reasonable for a 2 year old stove when you can't get one until (maybe) March 09 or longer. This may not last as noted above. BTW, a two year old stove has a transferable warranty for what that is worth. Ask them for all selling and warranty info. If they have that, 1200 is a fair price considering the market and the checks above. Others may have other suggestions. Hope this helps.