So, it turns out that this is all about Canadians driving to Bellingham, Washington to shop for things like milk, gas, and other items that are considerably cheaper in the US. For instance, a jug of milk at the downtown Vancouver Costco is listed for $4.60, while the equivalent at the Bellingham Costco is $2.50, a 1,000-gram block of cheese is $13 in Vancouver but $4 cheaper in Bellingham., a 230-