$142.00 for pair of 6.0-16 3 ribs on ebay right now. Probably $95 each at TSC or tire place. Dont forget $10/15 per for tube and $10 per for mounting.
Edit: I reread your earlier post and I still stand by my earlier suggestion of taking it to several independent car tire guys and asking for a used truck tire of similar width/height. If you can, probably wont be out more than $40 total
I hate to sound like a safety guy, but remember the front axle isnt solid like a car, so jack and block from near the tire on the axle, NOT the center front of the tractor,