Posted By:
Marc S.Call up Jim Stinson at (941) 697-4829. He is a noted collector/dealer that could probably help you out.
Even Jimmy Spence might have a lead -- though he doesn't usually deal such high $$$$, he might have access to a check: (570) 943-7788
Yes, actually it looks like Jimmy has a Mathewson check available, but he has it priced at $13,000:
http://jspence.com/eshop/item_detail.chtml?itemid=1013212&catid=496&cats=3&showdesc=no&showdealers=no&startrow=51&cf_id=155516297936689
Most checks I have seen have been closer to the $8,000 range.