The cost of thanksgiving this year in Illinois is more than the national average, both of which are up. The American Farm Bureau Federation says the national average cost for a family of ten to enjoy Thanksgiving is up 14% to $53.31. The Illinois Farm Bureau says a feast for ten in Illinois comes in at $58.15, or 8% higher than that national average. The price of a 16 lb. turkey in Illinois is nearly $3 more than the national average.