Shopping at 3M
1. In-Store Pickup - Avoid Shipping Fees from 3M and pickup from a neigh by store. More often than not, most merchants will have dedicated offices within the store will you can pay up and pay no fees.
2. 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.
3. 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.