"Artists Beware"

I used to send drawings this way through usps first class, but noticed recently they only offer flate rate priority. Seems like they gave their first class services to third party websites, and from what I can tell they all charge a $15/month aervice fee. :/ what's more annoying is you have to buy a $10 or more credit also before making postage purchases. is that what you do ? Unfortunately I don't mail out items too often so this is not economical for me.