There is a guy w/ the screen name "ammo can sales" on this board. He lives in Tigard and sold me my last batch. Clean cans, nice guy, and good prices. It may be worth the drive if you are getting enough of them or are in the area.
This guy is great and has the highest quality cans on the market. I have bought twice form him and have sent several friends who also bought. He is very knowledgeable about guns and stuff and likes to talk. Very worth the trip to Tigard! He is right off the main highway by about a block and just off the 217 Freeway.