I think I still have some of these.
Stamps.com - Stamps.com - 2016 Postage Rate Increase, New US Postal Rate Increase
USPS 2016 Shipping Rate Increases Start January 17th by cuttingforbusiness.com
2014 New Postage Rates - good reference illustration
New Postage Rate Chart for 2014 - Custom Wedding stamps from Perfect Postage available in all of these values! Repinned by Annie @ www.perfectpostage.com
Current USPS Postage Rate Charts - simple tables
This red-violet President Abraham Lincoln stamp, issued in 1954, became a popular stamp when the U.S. postage rate rose from 3 cents to 4 cents in 1958.
Postage Rates - An unofficial, simple, and up to date site explaining how much postage to put on your letters. (Great for when you are sending square envelopes, envelopes heavier than 1 oz., etc.)
Blog_2015 USPS Postage Rate Increase Guide
USPS Postage Rates -- An Excellent Primer on Shipping.. For some reason not available on USPS site...well, duh!