There are a few companies that claim to make fluoroelastomer bands, but they’re more than likely just re-branded Chinese fakes.
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Woven nylon bands were discontinued a long time ago. I think you mean sport loops, and it doesn’t seem like there are any this time ‘round. A Vitamin C Sport Loop already exists, though.
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I have to disagree. Material costs alone are likely to be around $3-10 per band, maybe 50¢ for packaging, but overall Apple is also paying for R&D, tooling, manufacturing, shipping, supply chains, pigments, etc. All of that adds up, and at the end I’d guess Apple spends about $20-25 to produce one band. Of course that number varies drastically depending on the type of band. Not real numbers, just my estimates.
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If you count discontinued colors, discontinued styles (RIP Woven Nylons

) and limited releases such as the Rio Olympics bands, there are well over 300 bands for the Apple Watch designed and manufactured by Apple and it’s partnering companies (Nike & Hermès)
Edit: There’s also the two titanium & ceramic variants in case material!