Costco just recently started carrying lc products - shakes, and the new Oroweat lc bread which I find tastier than normal lc bread since it is made primarily with wheat flour instead of gluten (still only 6 carbs too!). The bread is in packs of 2 loafs for $3.98 here, so you can freeze one while you eat the other.

As for regular food, I also buy my cheese there, as well as eggs, pepperoni, avocados, bulk packs of meat (mostly chuck roast - Costco has the BEST chuck that makes the most tender pot roast... mmmmmm), tuna, peanut butter, mayo and other condiments, and nuts. Also, if you are in OWL and eating fruit, I like to get their big bags of frozen mixed berries. I use them with a little vanilla Soy Slender to make smoothies. Mm Mm good

Happy shopping!