Where can I buy an Official NFL Equipment Wrist Coach?

I Play quarterback and I collect NFL Equipment to wear while I play my games. But I can't find anywhere that sells the NFL Equipment Wristcoach. If you don't know hat I'm discussion about it's the wristband with plays on it that NFL QBs close to Tom Brady and Ben Roethlisburger wear. Please Help?!
Answers:
If your coach doesn't give you one, what do you need it for?
I suggest they are not made by some factory, every NFL team makes one they resembling.

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