You can buy generic, press on door weatherstrip, by the roll. What you're looking for is similar to what others are indicating as "defender" style weatherstrip. The link I've given you is good for all types of weatherstripping, from window channel to, to door weatherstripping, to anything in between. Call 'em up, and let 'em know what your trying to accomplish. They'll help.
You can also buy rolls of this stuff at any autoparts store if your in a hurry. As usual, you'll pay more for it there (a lot more).
One more thing, you'll have to cut it, but its an easy project. If you take your time, the results will be excellent.
Do not, I repeat, DO NOT go to home depot/lowes/menards and buy the stick on foam window and door weatherstripping and attempt to glue/stick it in place. You will be much happier with the performance and look of the automotive press on style stripping. You'll thank me later, trust me.
http://www.restorationspecialties.com