Costco changes product lines all the time. It’s all based on the best deals their buyers can secure and sales performance. It can also be pretty local. Costcos near the coast have more watersport options. They use local suppliers for some food items.

We also have a “business center” Costco near us that has a bunch of stuff that normal Costco doesn’t, lots of commercial kitchen stuff, lots of stuff you’d find at mini marts more office supplies. Still sold in bulk but often packaged more for breaking up and selling individually. This place often has different selection than the other stores like more soda flavors including some that used to be at regular stores but aren’t anymore. So maybe if you can find one of these you’ll find what you’re looking for.