Sam's Club Gas Station in St Louis is for Members only, with pumps always showing the Member discounted price. The gas price is less than other stations, which is why people wait in line. It is usually busy and can be congested. The inevitable wait for a pump and sometimes slow pump dispensing can happen, so it is not a place to attempt when in a rush. It is very easy to use with the app, though not all cards can be used for payment. The line can be very short at times.
