Pool Access Wristband Suppliers

I am looking for affordable solutions to identify residents when using the pool. I have looked into wristbands but the cheapest solution I can find is .34cents a silicon band. I have not found a band that fits all sizes. That adds up quickly, any other suggestions or ideas? The solution will have to allow a random security guard or pool monitor the ability to scan the pool area and quickly identify who is a resident and who is not.

DavidP1:
Don't know if this would work or not...but check out your local hospital or medical clinic re where they get their wristbands. They may even have an unopened package on which you could see the mfr. name. I'm sure they are inexpensive and the contact may have something for you.