I have no idea what your chances of being searched are, but keep this in mind: if you buy gear in the U.S. you are guilty of possession -- not good but probably not the end of the world, unless you just bought a ton of stuff. If you try to cross the border with even a small amount and they bust your ass, you are now guilty of illegal importation, and I would be willing to bet that the penalties for importation are much more harsh than the penalties for mere possession. As far as California is concerned, for example, first time possession is a misdemeanor, whereas importing is most likely a felony. I am not trying to scare you bro, for all I know you will be just fine, but I think that you should be fully aware of the possible consequences of what you might do.