Another winner...since that's pretty much where we all buy our gas, even when traveling if the timing/distance is right. And even if you don't want to have to wander through the warehouse for the "sample" food, Costco's an excellent place to have a quick and cheap meal. $1.50 for a foot long hotdog and a refillable drink; plus the availability of decent pizza, etc. (They have become one of the top pizza takeout operations in the US and their pies are 18" rather than the typical 16" that most pizza shops sell)Costco gas and free food samples.
You're lucky to have such a nice supermarket! It had better be an emergency if I'm using any toilet but my own for a #2!Decent bathroom is underrated.
If i had to take a dump while at work i'd drive down to the local supermarket as it was very peaceful, clean and smelled good....at least until i got done in there