And as a Canadian seller I am delighted to hear this.
As a Canadian buyer of purses, I am also pleased to hear that I will have less competition. (Okay, that was tongue in cheek.)
You can ask potential sellers, before bidding, if they will ship directly by USPS/CanadaPost and not use the GPS, and they are allowed to agree. You should be aware that they get a tiny discount on their fees for using the program and are not told about the problems it causes for their customers.