Amazon offers the 3M 36" Door Edge Protection Film, model no. 08582, for $4.31 with free shipping via the steps below. That's $2 under our January mention, the lowest price we've seen, and about $4 under what you'd pay at your local store. It protects door edges from chips, scratches, and scuffs. To get this deal:

1. View the 3M 36" Door Edge Protection Film for $7.42
2. clip the $2 off coupon on the product page
3. order via Subscribe & Save for a final price of $4.31

Be sure to cancel Subscribe & Save after your order ships to avoid being billed for subsequent shipments.