Current USPS postage information can be found at the USPS website.
Guidelines for Reduced Postage
Mailing Services can reduce your postage costs with nonprofit postage and presort first class postage. Accessing these types of postage requires additional processing of mailing addresses and strict preparation of the material being mailed. Contact Mailing Services to explore your options.
The quantity of mail pieces and the size of those pieces can affect your postage costs.