Family Dollar

I went to purchase a propane refill tank. It was 15 minutes until the store closed. The cashier told me she did not know how to ring propane up on the register. I then asked the other employee that was just standing there if she could help me with my purchase. She said that they" could not sell propane after a certain time." I then asked "what time was that?" She then replied that she wasn't sure but it was before now." I then left the store without any purchase.