Do you or your business use many stamps? Well get ready for a price increase! You may need to stock up on your first class stamps. Going into affect on Jan. 27th the cost of forever stamps will go up 10%. The Forever Stamp now only 50 cents will go up to 55 cents. Metered letters will go from 47 cents to 50 cents. This is the biggest increase since 1991. Though the majority of mail sent by the average person these days is packages many small companies still mail things using stamps.