I agree with what others say about the owner having a terrible attitude.
I've been a customer here for a long time, and he is usually nice, excluding one unfortunate day that I went there to mail a letter in a small envelope. It cost me $4 and I commented "WOW! That's expensive!" to which he YELLED at me about how he was tired of 'customers complaining about shipping prices.'
Then, he SLAMMED the receipt and pen down at me.
SLAMMED. THE RECEIPT. AND PEN.
That was the WORST experience I've had yet at an establishment.