Where Do You Find Your Replacement Beads?

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I've noticed that some websites sell replacement beads for body jewelry at 16 and 14 gauge. What about 12 gauge acrylic bead replacements? I don't break many of these acrylic balls or anything like that, it's just that I was thinking it gets kind of expensive to keep buying the jewelry each time when you could just get different color threaded beads if they were available somewhere. I've searched all over though and apparently these are fairly hard to find, yet finding the jewelry with them isn't too difficult. Does anyone know a good source of these?