Costco has rolled out a new policy giving Executive Members exclusive early access to stores. Starting September 2, shoppers with the $130 Executive Membership can enter stores an hour before regular members. On weekdays and Sundays, they can shop from 9 a.m. to 10 a.m. On Saturdays, the window is shorter, from 9 a.m. to 9:30 a.m. This perk first appeared in late June, but enforcement was inconsistent until now.