Well, there's always eBay:http://www.ebay.com/itm/NVIDIA-QUADRO-F ... 3f10d907a3
Unfortunately you can buy entire copies of that laptop for $250-300 so it's kind of a toss-up as to whether it's worth it:http://www.ebay.com/sch/items/compaq%20 ... 2446001044
Your worst case scenario is that whatever fried the original graphics card started on the module itself and then worked backwards to the laptop, and then worked forwards again to blow up the second graphics module, which then went backwards again and blew up the second laptop. In which case you would spend $100+ trying to salvage the second machine only to watch that money blow up. Personally, I would go for buying the same make/model laptop, as cheaply as possible, and then swap hard drives. This may trigger a WPA panic-attack and an hour of quality time with Bangalore, of course, but unless you can scare up a chassis with the same card for less than $50, IMO it's time to cut bait.