Hi Tony,
Just quickly looking through eBay, they seem to be listed in lots of 5-6 for about $10-15 for the groups. Not sure if they are selling or what for. I’m honestly not sure if the fact yours have been colored on make them worth more or less than they would otherwise be worth. Sorry I can’t be more helpful—I haven’t owned any but just searched around after you posted as I was curious.
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