About a hundred of them may be worth a little over three cents at a recycling facility; as for collecting them for dialysis patients--that's an Urban Legend. Check this out:
I collect all the rings I can, our local school gets them and with the amount they do collect, they turn in for money! This year ONE class received over $400. So find out if your local schools collect them.
Foxrun is right. There isn't any monetary value for the rings. However, there are several dialysis charities who will exchange the rings for patient time on a dialysis machine. You could donate them. Also crafters would give their eye teeth for them. You could sell them on Etsy.com. Or email me, I'd love to have them if you have a bunch.
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