They are very hard to come by even though there are a good number of them out there. He does sign TTM though. Just got one back from him before Christmas. Could always try that if you can't find a certified one.
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Jim Leonhard Needs:
2005 Longevity Holofoil /25
2009 SPx Super Scripts Autographs Eight /8
Joel Effertz Needs:
2013 Bowman Draft Black Paper /1, Black Plate /1, Cyan Plate /1