Right now, Amazon has M-D Building Products 63628 All-Climate EPDM Weatherstrip for $7.15 and it’s eligible for Super Saver shipping.
This Dealmonger saves you money two ways, assuming you buy enough to get free shipping. Once for the cost of the weather strip, and the second because you’re not throwing money out the gaps in your doors. Our old ranch house has large gaps between the exterior doors, so I’ve been trying different types of weather stripping over time; this product looks like it would work well for the gaps I’m dealing with. I’d love to hear what other weather strip products Toolmongers like, especially the best self adhesive types!