They're not easy to find used. Assuming it is in good condition, and considering that extra mag runs $60, I think it's an okay deal. I paid a little over $1000.
For reference, brand new for $966:
No cc fees, but you still have shipping, and then the FFL fees. Again, plus $60 for a mag. I'd be interested in the two letter date code on it to see when it was made.