Nancy Kramer wants there to be free tampons in every bathroom in America. She's started the non-profit foundation Free the Tampons which is "committed to changing the existing social norm so that tampons and pads are freely accessible in public restrooms, just like toilet paper." You can tweet about locations you've found free/not free tampons using the hashtags #freethetamponsyea and #freethetamponsnay, if you feel so inclined.
Admission: When I was young and poor, I temped for a large company that had free tampons and pads in all the restrooms. I basically shoved as many as I could grab into my pockets every single time I went to the bathroom. Temp job only lasted 6 weeks—tampons lasted 6 months.