Alaska Air sale between Idaho and California

You can save 20%, which isn't chicken feed, when you fly on Alaska Airlines between cities it serves in Idaho and the following cities: San Jose, Sacramento, San Francisco, and Oakland.

Travel is from Sept 5 to Nov 15 and you must use e-Cert code EC04607 on Alaska's site only.

For example, Boise to Sacramento is $158 vs. $198; San Francisco to Boise is also $158 RT. You can also buy these fares one way for $79.  This sale ends Aug 5, midnight PT.