I was on my way home through Chinatown last night and decided to stop here for gas. It's was only slightly higher than Costco prices and since it was later, it was an easy in and out.
They have a multi-point pay system. Insert your card and then enter the pump you're using. After pumping, you return to the pay area to get your receipt. A painless process and at 10:15 not a crowded one.