Deeb,
Marks car is for to be sold at or around $39,900, the other I have no idea as it is at $40K, not met reserve yet with 6 days left to go, so who knows where it will land. I suspect with a write up that reads "$47K invested in upgrades" = high reserve. Spending that kinda loot on ebay would scare me personally.
I don't know the '72 GT5 replica, but I remember seeing it for sale somewhere previously and quite recently, but cannot remember exactly where, I thought ebay still, but I can't pull it up in completed items, so maybe my memory is fading.
There are a lot of cars on the market away from the ebay forum, besides the PI and PIM listings the best resources I found useful outside ebay were/are
www.hemmings.com and ww2.collectorcartraderonline.com a search under De Tomaso on either will turn up a number of Panteras for sale. There's even an 85 GT5 priced at $275K, kinda hopeful I think.
Good luck with the search
Julian