it was at a home-improvement - diy store, in Belgium where i live, so a bit out of your area i guess, but i can't imagine something similar not being available in the us.
they where not by the foot, but rather typical door-width strips with a plastic top and an adhesive strip to the side so you could stick it to the lower side of a door.
two strips should be more than wide enough to cover the total width of a car, and perhaps they're flexible enough to be bend to the shape of an airdam.
anyway maybe you'll spot these things in a shop once you know they exist... stores might not stock then during the summer, but on the other hand they may be on discount during the summer.
perhaps a company that specializes in (custom)doors or gates might have this stuff my the foot though
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aer·o·dy·nam·ics: the science of passing gass
*i can coast for miles and miles and miles*
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