U.S. Postal Rates and Fees

USPS
Prices 
https://www.usps.com/business/prices.htm
https://www.usps.com/ship/compare-domestic-services.htm
First-Class Mail
2-3 business day delivery for envelopes and small packages from $0.49 at a Post Office™ location.
Features:
Our most affordable service for mail up to 13 oz
Can purchase USPS Tracking™ to confirm delivery of packages

Standard Post™
2-8 business day delivery for non-urgent and oversized packages from $5.60 at a Post Office™ location.

Media Mail
2-8 business day delivery for books and other educational media from $2.69 at a Post Office™7 location.

Priority Mail
1, 2, or 3 business day delivery5 from $5.05 when paid online.

Priority Mail Express
Overnight delivery to most U.S. locations or your money back1. Prices from $13.09 when paid online.