Sauer's is the best tasting mayo here but it's not available everywhere. I've never seen that brand in the US but Best Foods was always the best. When you find Hellman's or Best Foods it is not the same taste, something about the flavor is familiar but it falls way short. I'm told you can get the American-made Best Foods at Costco but I don't think I've tried it from there so couldn't say with certainty.
At Sam's Club you can find Sauer's mayo and it has the flavor you know, if you were a consumer of Best Foods on the other side. Costco does not carry it, and so for mostly that reason I am a customer of Sam's. They also have their store brand Golden Hills instant coffee that is quite like Taster's Choice but at a much better price. I also like their non-dairy creamer there. Those are several reasons I shop at Sam's.
One thing I have found at Costco was Bisquick in restaurant-sized boxes. That seems a thing of the past though, they haven't had any for quite awhile. I asked the customer service desk about it. They found it on the computer but just gave a shrug about getting any more any time. I asked Sam's if they would get Bisquick but they told me they carried a different brand of "hotcake mix". I told them it was not for hotcakes but their reply was a shrug. It did no good to tell them Costco carried it.
The place that has Sauer's mayo and Bisquick both is Superlake in Ajijic, Jalisco. We make periodic trips there, maybe three times a year, so stock-up on those things. Also at Superlake is grits. They have Alber's, Quaker, and the packets of Quaker instant grits for a quickie grits fix. You can find many items at Superlake that can't be found anywhere else in Mexico. Ever looked for a can of Dennison's Chili here?
"There is no route out of the maze. The maze shifts as you move through it because it is alive. "
— Philip K. Dick (VALIS)