What to Buy in US (Everett WA) Before Crossing into Canada

There is a Costco about 2 miles north of the Sumas crossing, you drive right by it on the way to HWY 1. If you are concerned about produce, we find it to be less expensive in BC than in WA. Dairy is more expensive, Liquor is about the same as WA but beer and wine is much more expensive in Canada.