Shopping at 3M
1. Sign Up For Multiple Email Addresses - Use a couple different email address to accumulate more 3M promo codes. Many of the big retailers will come out with single-use coupon codes and this will increase your chances of savings.
2. Patience Pays Off - Take your time and revisit the site a couple hours later; 3M will send you an additional promotion to entice you to complete your order.
3. Buy a Discounted Gift Card - There are a few places online, such as GiftCardGranny.com, where you can buy discounted 3M gift cards to save money on your order.