I live in Calgary and make trips to Montana for my parts. Shipping / brokerage always kills the value of parts coming across the border so I decided to do it myself.
Usually shipping is included (lower 48) and so the items arrive in Sweetgrass, MT for free. It's then my time and effort to drive down and collect them - that being said, the dollar's I've saved have more than paid for my gas and time.
Probably doesn't help you out much but ya, that's how I do my mods.