I have had Prophet River import a number of rifles for me... go to their website (link in the above dealer toolbar)... go to the importing firearms link... print the five page document... it is self explanitory. Your first job is to find a gun that the seller is willing to ship to PR's FFL in WA... tell the seller that there is NO EXTRA work for them... they just ship as usual and your importer does the rest. You have to fill out and send pages four and five of the import forms... the seller in the USA MUST fill in their portion and attach this on the outside of the box next to the shipping label... once received by PR's FFL (Northbound Sporting) in WA there may be up to a four week wait for the shipment to cross the border to PR... as soon as PR receives the gun, they will call you... you make final payment at that time for the import fees, taxes on the purchase price ( converted to Canadian) and shipping from PR to you.
I just received one import last week and have one in WA waiting for the border shipment. It is a very easy process...
For fees, refer to PR's website.