It won't be any different than the cost of planting Tifton 85 or Coastal. The quote I received last year was $25 per acre to plant, plus the cost of the grass - sprigs or tops.
The neat thing about Jiggs or Tifton is the abilty to buy it baled green and then spread the tops and disc them in lightly - all before a rain or at least into moist soil. Jiggs is incredibly aggressive. I have a small nursery of both and cut the tops every now and then and replant them where needed with a little phosphorus sprinkled around. It will get up and go!