Just about all the power supplies for the Gateway Solo's will work as a perfect match, except for the Liberty series, the Solo power suppies even are higher wattage and better quality. One thing Gateway does is make all their notebook power suppies the same (except for wattage).
I bought several of the GCT's from the same person you referred to on ebay and got the Solo PS from Adeal on ebay who sells a lot od Gateway Solo parts (about $20 for a new one)
i-opener opener laptop notebook computer help
drivers dll free windows dos repair fix linux mac macintosh 2000 95 98 nt pc
configure hardware software sound video netscape explorer network networking
lan wan software cmos fat bios printer card mouse modem ide scsi cd rom
controllers scanner tape hard drive cgi scripts source code mp3