Assuming the systems work I'd say thats a good starting price. The Atari box is in nice shape which would add to the appeal of the lot. Also the remote joysticks (again, assuming they work) are worth a bit too. I don't think $100 for the lot is out of the question at all

6 x 2600
2 x 7800
1 x 5200
1 x odyssey 2

plus atari box, many controllers including remotes. Yea the more I think about it its a good deal for sure. If I had the cash I'd offer you that.