From the benefit of anyone that may have followed this thread or need the info I have found:
1)e'd a dealer friend who indicated that the part wasn't listed as availalbe but when you put the part number in - it does come up as a 5 day ship item and his wholesale $$ was 722. He also noted that he wasn't sure if the attach points were in a non seat H2 stating that in the Tahoe ordered w/o the third seat they are not there.
2) the dealer selling the vehicle said it is indeed a 430/500 (or so) when buying the car - but from parts it lists for 1400+ and he
said his cost was 900.
3) a few people here and our local state dealer said that the attach points are indeed present - I cannot confirm this at present.
Sooooo - the person with the ebay listing is not giving bad information with their indicated list price.
Thanks all again