Costco buisness centers are usually a lot quieter, and don't have the free sample venders clogging up the aisle. Memberships work for both.

Costco business centers for 50lb bag of bread flour.

Regular Costco for rotisserie chicken.

In life you can't have everything.

I've noticed that my local Costco business centers actually tend to have a larger selection of things like soft drinks and single-serving packaged snacks, and not in obscenely large quantities (any more than normal Costcos).