Originally Posted by edx1
There are several bimmerfest sponsors in CA and Oregon, not sure about Canada(haven't looked). I'd recommend you buy it elsewhere where they will deal with you. I'd personally be dealing with the guys in CA if tax wasn't 10% (It's 6.5% where I am, so that's over a thousand more for tax).
The only downside is the dealer you take your car to for service might not give you a loaner car if you didn't buy the car from them.
The sales tax will be charged based on where you live, not where the dealer is located, even within California.