Costco is the best. While their meats are not always the cheapest, you can always count on Costco for the best price on fruit (frozen and fresh), vegetables, and home supplies. I've gotten great deals here for other various items like vacuums, toiletries, medicine.. you name it.
The Costco bakery is a game changer and my go-to for pot lucks. Their cookies are SOOO good.
Plus, I go here for cat food and cat litter.
The only negative would be how long the checkout lines can get. I'd love it if they had an Express line for people who are buying 5 items or fewer. (Yes, sometimes I run in to buy a single bag of frozen strawberries - it can get frustrating lining up behind people with massive Costco hauls.)
Costco parking lots are always a mess, but this one is less of a mess than others.
I've always found the employees at the Gilbert location to be much nicer than the Tempe location.
Returns are a breeze, but don't be the asshole returning something you clearly got plenty of use from.
Pro tip if you need photographs from Costco: download the app and upload photos on your phone, then they'll be ready for you the next time you mosey down to Costco!