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

From my point of view:

If you eat meat, bring it..pricey there.
Veggies may or may not fly depending on who you get.
GAS filled up.
We bring any canned goods, packaged goods, and if we are changing oil, we bring that stuff also (and give the used oil in). Canada is mostly pricey so we bring most everything
and then carefully select places to eat out, etc.