It is REI's Anniversary Sale (founded May 1938).
You should have received an REI catalog in the mail. On the back, there is a coupon for 20% off everything (except for items that end with a $._6 or $._9) If you get emails from REI, you should be getting that coupon, too.
One item I noticed in the catalog was the camping kitchen. Regular $109. On sale for $79! Do I want it? Nah. Negotiations are ongoing with my wife to persuade her for me to get it!
