RxG300

okay, so i just bought my SC300 today, for what i think was a pretty decent price. HOWEVER, the dealer didnt have ANYTHING for keys except a plain master...as in, NO KEYLESS REMOTE! its not a valet, because it locks the glove and trunk. now, i have searched, and gotten mixed answers about this BUT: can i simply order a used remote key from ebay and program it to work with my car? or do i have to order the two key set from lexus-parts.com...?

i really would like keyless, as having to manually unlock my LEXUS seems a little stupid, seeing as my 95 jeep still has all its original remotes working... grr little local dealers. lol