I tried buying from him, but they were all gone. I am guessing the first couple people that saw it bought them all. $50 is a great price, I wish I had seen it sooner.
As to people that don't seem to understand the supply-demand model; I suggest you go ask your banker/broker about it. Supply demand curve is extremely simplified, there are so many other variables that go into play, in the real world, that it is just plain stupid to say that graph explains prices. Go to the commodities exchange on wall street, and try to make money with your "supply demand" curve.