Greg,
Last year I bought six 6:00 x 20 Denman tires from Coker (I think they were $95 each plus tubes and flaps for each wheel). If you decide to buy from Coker, check to see if they'll be at a swap meet or car show in your area. If so, you can order ahead of time and they'll have your tires on their semi when you get there. I saved about $150 in shipping for my six tires this way.
1935 Chevrolet 1.5-ton 1963 Oldsmobile Dynamic 88 2-door
1965 **** F-250
1980 "Honda-Davidson" CB-750 Custom
1989 BMW 325i Convertible (wife's car)