also, what I see on Ebay looks reaaaaaaaaaaally similar to the Targus piece butwithout the brand on it. (you can do a search for "nikon D200 battery grip")
I've sold my Subal ND20 housing but have a Nikon D200 with battery grip for sale. Its in perfect condition, done just under 6000 cycles. Complete with box, manuals, all cables etc. Battery grip also available: boxed, in perfect working order with all the extras. No bumps, dings, dents or floods.