A USPS mailing permit is permit assigned by a single post office for a single class of bulk mailing. It allows one to enjoy postal discounts for mass mailings. You probably don’t need one of your own and you can use Roadrunner Mailing Service's permit for FREE when we mail for you. In 2008 the cost for your own permit is $180 to register and $180 for the annual fee so the first year will cost you $360 and it really doesn’t make sense to get your own permit unless you do many mailings each year. If you’re considering your own permit, call one of our account executives first, we can probably save you some money.