Going postal

Here is a letter from a reader. Does anyone know the answer?

"Yesterday I went to mail a painting at Postal Plus. I was quoted a price of $99 and change. When I showed surprise, the owner recalculated and quoted me $62 and change. Still not satisfied, I went over to The UPS store on Grand. For the same painting, packed the same way, I shipped it for $38 and change. Why is Postal Plus still in business? People should be warned of this. That's too much of a difference for the same service. "