The cost for first class stamp will increase to 55 cents ea on Jan 27, 2019. there are other changes but that is one of the biggest increases. But if you think about it, what else can you get for 55 cents? A letter across the country in 2 business days!
Some more good news is that the cost for each additional ounce in first class mail decreased to 15 cents ea (from 21 cents ea).
Meter (or permit imprint) increase from 47 cents to 50 cents each.
There are increases pretty much across the board of all classes of mail–first class presorted, commercial (bulk), nonprofit and package mail. However, the increases are nominal–and in especially the case of nonprofit mail, still very affordable!
Parcel prices increase 12% as the USPS tries to be more in line with parcel carriers.
Click here for a fact sheet summarizing the changes https://postalpro.usps.com/mnt/glusterfs/2018-12/2019-price-change-v.37.pdf