We are a New Jersey based company in business since 1975, and we can invoice you in several ways.
We can invoice for postage and services both at the same time or bill separately if that is easier. And although we won’t require payment for our services until after the job is finished, the Post Office requires payment when the mail is presented to them. So you can pay in two payments. In fact, you can even make the postage check payable to the Post Office directly (although you still need to send it to us). That may make it more palatable to you budget, since postage is usually a different line item and an expense you would incur anyway.