shipping it back and fourth from colorado might get pricey, the finished driveline will weigh like 40 lbs. i live in california.
for the materials it takes to make one (tubing, cutoff wheels, welding wire, welding gas, cleaning solvent) and my time and labor = $80
if you want extras i can add some stuff like a zerk fitting onto the shaft so you can grease it without taking it off the truck...
i can also add thin pieces of metal to the sides of the male shaft to make it a tight fit for smooth silent operation. i think i already said that a couple posts up. that stuff is extra work and will raise the price a little though