I have 4x6 standard postcards. I was told from USPS that it was not even worth buying a mailing permit because it would be the same price. I would have to pay more because of the permit. USPS have postcard postage stamps for .28 I wanted to go the cheapest way with postcards because of the price of printing postcards & postage.
For those who use postcards, how much response have you had from them?
Thanks for all the feedback!