That's good to know and worth checking out when I need another long zipper.
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Great source GT, I've only used Quest Outfitters for zippers.
I've ordered 4 zippers from them now, and have been very happy with the products and service. You can custom order continuous length zippers in various sizes and custom lengths, with a couple of options in sliders, and it turns out to be around the same price, shipped to your house.
Just another option, ymmv. Supporting the local economy is good too.