Hobby King, in china. Seriously. Unless you go the USA from time to time, and could get them shipped to a USA address buddy. Then you could buy from the USA warehouse.
You can go to local RC stores when in a pinch. They usually carry a line. Expect to pay 2x or more H.K.
It's sad.
You are close to the border though. Next time you are in Washington state, maybe look into a PO Box.
I'm a 2 1/2 - 3 hour drive to Niagara/Buffalo NY, alot quicker than 1-6 weeks from China.
When I'm ready to purchase my Lipo,it will be from the US warehouse one way or the other :wink: