For anyone buying the GCT's from eBay that don't come with power supplys, here is a good source:
http://cgi.ebay.com/ws/eBayISAPI.dll?ViewItem&item=2007207427
Adeal has LOTS of Gateway parts, I have bought from him many times and even bought a GCT from him not too long ago (came complete and with an ethernet adapter instead of the HPNA like the auction described) He has always been a good seller, ships very quickly and always has good quality
He is currently selling them for $35 plus $6 shipping in hi eBay store; He sells the AC cord extra for $4 or Radio Shack has them for $3. The complete AC adapter from Adeal will cost $45 shipped which is not too bad considering it's a larger power supply and has the correct end that fits the GCT.