I'm single, and I do shop at Costco occasionally. Not to stock up on everything, because I don't have a deep freezer or enough pantry space to store it all, but there are some things like cheese, olive oil, coconut oil, and baking soda, etc., that I like the larger quantities of. Also they have a better selection of prepared meats and fish that I can just microwave and go when I don't feel like cooking. I think it's worth it.

Buying in bulk usually saves in per-item price. ie:

Roll of toilet paper sells for $2 individually
Pack of 20 sells for $30, or $1.50 each.

I've never found it particularly useful, but that's because I've never really been one to need (and for a while, couldn't store) the amounts that they sold and what they had. I know a lot of people in this group do, though. Even with the cost of membership, if you buy enough of the things they offer, it is a savings in the long run. You do sacrifice selection, though, so if you don't like the brand or variety they offer for X item, you're out of luck.

I do go to Gordon Food Service occasionally, though. Same idea, though smaller and doesn't require a membership. It's the same place many restaurants get a lot of their stuff. Great place to buy spices in bulk or the utilitarian stuff for a party (flatware, drink mixes, etc).

I don't get my meat there but I do get grassfed cheese and butter at a fabulous price as compared to the grocery store (Kerrygold), wild salmon (frozen), smoked salmon, organic greens and salads and lots of fresh veggies (cauliflower, string beans and fresh Brussels sprouts), and lots of avocados. We also get olive and coconut oils there and, most importantly, my Paul Newman coffee K cups !! We definitely save a lot on all these items. But I'm feeding a big family so YMMV.

I had a Sam's membership but could never really get into going amd it didn't seem worth it to me. ..but it was also a one hour drive each way.

We had a Sams until Costco moved in. Now we do costco for the organic and grass fed options they provide. We buy toilet paper, paper towels, dishwasher detergent, lunch meat, sliced cheese, shredded cheese, block cheese, flax seed, organic canned goods, frozen organic fruits and veggies, antibiotic free beef, chicken and some fish, pickles by the 3 gallon jars, avocados, mushrooms, etc

Our costco doesnt carry grassfed milk or butter, but if they did id get them there. We have chickens and pigs so I dont get the eggs or pork there but cheap prices on free range eggs there. Cheap mayo but the gallons if you dont make your own.

You can always walk in without a membership and check it out. We did before we purchased the membership at each place. Take a list of things you normally buy and their per unit ball park prices and check it out. You wont know if it is worth it for YOU unless you compare on things you buy.

I don't like Costco for some reason, I find it lacking some of the stuff and more pricier, and SAMs is 10 min away

I used to have a Sam's Club membership, but know I go to GFS. GFS is free, no membership required. I love their chicken, my dad swears by their salmon, I buy cheese in bulk there and divide it up and freeze it when I get home.

I shop for my food almost exclusively at BJ's club.

Why? Because I eat the same food in large amounts. I can get chuck roll for $3.99/lb (in 15-25 lb slabs), boxes of burgers for around $3/lb, bacon for under $3/lb... and, if I want eggs, I can get 5 dozen for less than the cost of 4 dozen at my grocery store.