Buffalo(other than bugers) in central NJ
3 places to consider. All have buffalo and bison on their web menus.
Clydz, New Brunswick
Peacock Inn, Princeton
We haven't dined at Clydz in a long time so maybe others can give a current report. Segeantsville Inn has a long history of game entrees (I recall the old chef/owner from Clydz is or was there). The bison carpaccio at Peacock is excellent. The bison sirloin entrée at the Peacock is a newer addition and we have yet to try.
edit: Just saw your same request from a couple years ago. My reply above echos the old thread...