Although this may be against policy, I am not sure, here are the local stores I like dealing with...
A) the aforementioned Bayside Performance (Great website with descriptions, product knowledge, reviews, and pricing.) I like to know my choices before heading out to a store to buy gear/parts.
B) Imperial Motors in Burnaby. Great staff. GREAT pricing. Very nice store, a little more organized than Bayside because they employ more staff and have more room to in their warehouse.
C) Holeshot Motorsports in Langley - Only shopped there a few times but have found a great selection. Prices are usually higher but sometimes you can find the odd bargain.