This is a great idea! I do buy most of my meat and cheese and nuts at costco, as it is always cheaper, no matter what the sale at the grocery, but I also shop at trader joes b/c they have fantastic foods that re not available at costco, and they are very affordable as well. Some things to keep an eye out for at trader joe's are their own artisan mayo for $1.99 (0 carbs, nothing fancy, just simple good mayo) and the low carb ceral also $1.99 (not trader joe's brand, but there are only a couple, just check the cereal aisle) and they are the only place I have found unsalted macadamia nuts! (raw and roasted)