Thanks for all those who helped. Not sure why some of you are calling for a ban for me asking a simple question - as i stated in the OP, its not even me thats considering buying, its my brother in law, i'm not even a costco member.
Also, why are so many up in arms about possibly returning it? Its not like he would try to return it fraudulently...
The policy notes (thanks for the link above):
Merchandise: We guarantee your satisfaction on every product we sell with a full refund. Exceptions: Televisions, projectors, computers, cameras, camcorders, iPOD / MP3 players and cellular phones must be returned within 90 days of purchase for a refund.
Why wouldn't price be part of the satisfaction guarantee? If he is unsatisfied because its cheaper somewhere else 1-2 months later, that seems reasonable to me. And also, he's not buying with the intention of returning it, he just wants to know the option is there.
Anyway, again, thanks to those who helped...