Lower Bay Basement RV Door Rubber Seal Replacement?

[encantotom]

i would love to find a place to buy the rubber bay door seal for a cheap price. this is the hollow round rubber that pushes onto the aluminum lip around each of the bay doors.

i can find it at the local auto specialty store, but it is very expensive there. like $1.50 or more a foot. since there are alot of bays and as much as 8 or more feet for each one, i dont want to spend hundreds of dollars on this stuff. (ok, i am a cheapskate)

do any of you have a cheap source for this stuff?