Same seller has GT35R turbos for US$389:
http://cgi.ebay.com/ebaymotors/GT35R-GT35-Ball-Bearing-Turbo-Anti-Surge-T3-/330477503311?pt=Motors_Car_Truck_Parts_Accessories&hash=item4cf1fe834f
Other eBay sellers generally sell these around $1200 - $1400 ... what's the catch?? Feedback seems OK too.
... and T3/T4 hybrids for US$139:
http://cgi.ebay.com/ebaymotors/T3-T4-TURBO-CHARGER-T04E-0-50-A-R-/330477504377?pt=Motors_Car_Truck_Parts_Accessories&hash=item4cf1fe8779