My weekly errands consist of a trip to Costco for gas and then we sit there and say "Is there anything we need from Costco?" Regardless of the answer, we go in. One thing I have noticed is the samples are better during the week than on the week days.
Other than that, it's Costco.
I wish I could remember the guys name who works in the customer service area but we stood there waiting a long time to speak with someone about a rebate check and once he was available, he walked away to go to lunch. THAT WAS SO DISRESPECTFUL!