The Stewart's chain of convenience stores (northeastern NY and southwestern VT) still have the pump, then pay option.
The workers inside have security cameras and are also alerted when someone is pumping prior to paying. They will use the intercom and say, "WELCOME TO STEWARTS PUMP 5!" just to let the customer know that they're watching.
There is a local Sunoco station that incentivizes using cash (although not pre-pay) by dropping the price/gallon by 10 cents if you don't use your card.