cue dealors
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Try one of the cue dealors here on AZB. Bill at Cornerstone would be my personal pick, but, he is the only dealor I have had a transaction thorugh. I am sure that the others will work with you to find an R12. Sureman also comes to mind for offering R series Schons in recent history. Keep an eye on Ebay as well, I saw one on there just a few weeks ago but don't remember what it sold for. Best of luck with your search.
Tom