You don't need to go all the way up to Canada to get Humpty Dumpty chips (or other brands with the same flavors) -- they stock them all in Vermont. I looooved the Dill Pickle ones (Lay's even did them up in the hinterlands).
Over here, I've just become enamored with Worcester Sauce (by Walkers). They have the best parts of all the other flavors I like. Tangy, sweet, all around goodness.
I'm not a huge fan of Monster Munch. It's ok, but I wasn't as thrilled as the boyfriend thought I should be.
Oh... and prawn cocktail tastes nothing like prawns. It's more tomato-y, like a cocktail sauce. Though the Pringles tiger prawn and garlic ones do taste a little fishy, but in a good way.