Check over at www.federationmodels.com - he'll probably have any garage kits that are available. The only mainstream plastic kits were two figures kits from the original movie, by MRC (I seem to recall). They're probably long gone.
Well people about 2 weeks I won on e-bay a Stargate kit from a GK vendor in Canada who said that he mailed it so now I am just awaiting delivery from USPS. Thanks for everyones input and help. BTW I am planning on lighting it using the Warp/Technomania kit.