As much as I'd like to support to local guys, the prices they are asking are generally more than buying from the US, shipping, AND paying duties.
With that being said, I've purchased from @
fteightysix and @
ft86SpeedFactory at very good prices.
Anything that's quite expensive to ship, such as headers, exhaust, etc. it'll probably be more economical to source as local as possible.
In addition to the above, I'd also check out "uniq performance", driftaround, and NV auto. Their prices were decent on some items.