I think its worth 55 cents (stamp) plus $1.45 in labor and envelope = $2Yamadude if you stop and think about it it's not bad. It takes time to pick a order, package it and print a label to ship it. I'm sure it would take at least 10 minuets to get your order ready. Plus the cost of shipping.
How much is/was 10 minuets of your time worth when you are working?
I've bought decals off of EBay for such costs.