OUTRAGE at the Post Office

So I went to the post office to post my completed red heart. I wasn't sure how much the postage would be so I asked the nice lady at the counter... Well, "whats in the envelope?' she asks. A sqare of fabric I say. That wil be $13.50!!!!! Are you Kidding????  If it contains a letter or a card it's a letter she says. If it contains anything else it's a parcel! After a heated argument (completely out of character for me!) she let me post it for $2.90. The moral of my story is - Don't ask - just post!!