Need advice on where to buy building lumber in Washington State

Anyone here from Washington State that can recommend a good lumber supply place near the Osoyoos border, or within a few hours of it? Need Grade-A Fir 2x12, 2x10 and 2x6. Can't get decent wood up here in BC lately.

Before you start buying, check if it is legally and cheap to carry lumber across to the Canadian border

Thanks AlexGT, I was not aware of that. Last week on the news they talked about Manitobians crossing the border and purchasing Canadian wood exported to the US and bringing it back to Canada, paying all the duties, fees and taxes and still saving at least 25% so I thought it was a good idea to do too. After looking at your link, it may be not so easy since the wood we need is not processed.