Where can I find rupees?

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I'm looking for acrylic/plastic, big faceted 'gemstones'. I found a seller on eBay that offers a bag with these, but it's part of a package, custom made costume deal. I've sent a message to the seller asking if they will sell just the 'rupees' and the bag, but I haven't heard from them yet. So does any Zelda fan out there know where I can get these from? I'm sure a craft store must have them somewhere...I just don't know where. Thanks!