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MarkBetween Heritage, Legendary, REA, Lelands and Ebay, you will have your choice of literally dozens of Ruth signed balls.  These balls range from the very affordable to the pristine.  I probably even forgot a few other auctions that will occur over the next month or so.
With the economy the way it is, I imagine the time has never been better to pick one up (within the last 10 years, anyway).   Best of luck, and let us know if you acquire one!