Zipper tape by the yard is available in full yard increments.
YKK® #8 Coil Water Resistant Zipper Tape by the Yard
This unique zipper tape has a dull matte vinyl coating that keeps the water out, without having to add a storm flap. Used for everything from bags and packs to venting and pit zips in outerwear. Can be cut into any length. At least one end has to be sewn in.
Requires specific slider, see - #8 Coil Water Resistant Slider. Sliders sold separately.
#8 - $7.99/ yd.