Did you see the seller had a quantity of them for sale and that you'd have to buy two to get them as they were originally boxed as two together?
Price looks good for NIB. Nearest thing going on trademe value wise for Atari's at the mo is :
http://www.trademe.co.nz/Browse/Listing.aspx?id=311820373 Vintage Atari games consoles x2
Current bid $305, 12 carts, 9 tapes.
I do advise people to move auctions to Computers/Vintage when I see the odd thing which is getting no views or bids, however, having seen a couple high selling auctions placed in the Antiques sub categories, I would probably list here if I wanted to gamble on the best price. Bidders are oft unaware of the vintage computer scene and nostalgic value sure drives the prices upwards.