Hi ferret,
Glad to have you here! :)
I guess if you're after the authentic bands you need to get it from the source -
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and check if they allow these to be distributed through authorized resellers, so you can cut short the chain and apply to be a distributor.
In my search for possible suppliers I encountered a lot of silicone wristbands named Power bands, mostly from China manufacturers. The genuine ones are created by Power Balance based in Orange County, California.
Hope this helps. :)
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Take care!