You should be able to find lots pretty soon, thanks to emerald ash borer:
Wikipedea:
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On March 11, 2009 it was confirmed in Mifflin County, Pa. This county lies in the Eastern Central part of the state. As of August 12, 2010, the Pennsylvania Department of Agriculture reports that two-thirds of the state has been infested with the EAB, most in counties west of the Pocono Mountains.
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Seriously though, check for restrictions on moving wood!!