Of course, you get what you pay for. I know this can be a sensitive area for some people. I just want you to rationalize it realistically. Think about those weekly grooming s and the chopped steak you've been feeding him. Can't really argue with the post office.
Stamps cost what they cost.
Let her quit and save the money if she hates them. See if she'd be willing to chip in the cost if she loves them. If she's gifted, maybe her teacher could use some help teaching the beginners in exchange for her lessons. Sell it all at consignment and replace with washable items. Wear only on special occasions.