I think Costco is pretty well known to sell "grey market" items like luxury watches, Apple products, Clarisonic, etc. I know based on personal experience that the warranty is invalid if you purchase a Clarisonic from Costco (i.e. not approved retailer). I wouldn't want to risk that with a J12.
Here's a link where Omega tried to sue Costco to keep them from selling their watches:
http://www.jckonline.com/2010/12/14/...ey-market-case
Here's a link where Omega tried to sue Costco to keep them from selling their watches:
http://www.jckonline.com/2010/12/14/...ey-market-case