I haven't then again I'm buying Kirkland brand.
When you compare costs you also need to make sure you're comparing ply count, roll count combined with ply count combined with how many sheets in each roll, sheet count on paper towels and quantity. Just comparing costs won't do it
I've never seen toilet paper cheaper than the Kirkland brand, when you compare how much is in each roll. Sure, you can find a "per roll" price that is cheaper, but even "large rolls" from the grocery store do not have as much toilet paper as the Kirkland rolls. And, it's really NICE toilet paper. It's a strong preference among my family members. My son asks for to be brought to his tiny studio condo and even he has room for it. My daughter has us bring it down to her apartment too.
I think it's a myth that if you are a small family it doesn't make sense to shop at Costco. We shop there 2-3 times per month, and it's just my husband and I now. We buy coffee (the Starbucks packaged for Kirkland), which is often on sale, and typically costs us $5.19 a pound....WAY cheaper than anywhere else I've seen. We use a 2.5 pound package in just over 2 weeks. Gallon of milk at the best price (our store sells single gallons). Eggs (2 dozen), which we easily use with just the two of us (I bake, DH loves them hard boiled or scrambled for breakfast). Flour (best price by a mile, and it's organic....a little less than I'd pay for "conventional" flour in a regular store). Greek yogurt...$2-3 cheaper than the grocery store per container, and just as good. I eat it for breakfast every morning, and a large carton lasts me less than a week. Nature's Path Pumpkin Flax Granola. At least 30% less in cost than the grocery store, and often more than that because it goes on sale. We also buy tires for our cars, gas for the cars, and numerous articles of clothing (which are sold typically as single items...same as any other store), socks (DH LOVES the kirkland sweat socks...they are really high quality. Some of this stuff you can technically buy "cheaper" but not for the QUALITY. As others have mentioned, rental cars are a really great deal most of the time, and their travel prices are generally quite good. I found the lowest price on hotel in Cozumel through Costco not even counting that they included a costco cash card worth almost $500. Then, the cherry on top os that my membership (executive) pays for itself in my rebate. And, the credit card they offer is THE best for cash rebates. Roughly $1000 a year is what I get. Nothing to sneeze at that's for sure.
Another +++ for Costco is that my store has had many of the same employees for the entire 14 years I've been shopping there. That is just not something you see in retail. And, their checkers are great...fast and accurate. Never had an issue with them. Ever. Cannot say the same for certain other retail stores. Their employees are well paid (for retail) with GOOD health insurance benefits. They have a loyal workforce, which leads to a better experience as a customer.