Shopping at 3M
1. Newsletter Signup - 3M will consistently send out newsletters where you can find free coupon codes to save on your order.
2. Stackable The Codes - 3M comes out with a variety of coupon codes, where many times you can use more than one on a single order to maximize savings.
3. Buy one, Get One Free - This is a great way to save additional funds on a particular product when you are buying the same product.