We're not Costco members but I'm debating buying a membership (there isn't a Costco around here) but they have the formula DS eats online for a heck of a lot cheaper than I've ever found (34oz for $27ish vs. the 23oz tubs I buy here for $24!) Anyway, I don't want to buy a membership for this if shipping is astronomical. Can anyone shed some light? I tried to fake going through the checkout but it wanted a membership #. So. The point of my thread... is the shipping reasonable?