Sheetz is actually a GREAT convenience store. They all have a little restaurant inside with reasonably priced fast food, and I think they're all 24/7.
Nice, clean, well-lit.. they make me happy.
Their motor oil prices are a little steep, but not worse than most places.
The last time I stopped at one it had Pennzoil at a little over $3/qt, and store-brands at SAE HD 30, 5W30, 10W30 and 10W40. Also a house-brand Dexron III/Mercon ATF.