If you order the parts and do it yourself, i would imagine the price of the parts would be somewhere around $120 or so including shipping, maybe a little less. If you get it done at a shop, they will probably tack on about 2 hours or so of labor and maybe a little more for the parts. I would say a reasonable ballpark estimate might be around $300 or so.
1999 Dodge Ram 2500 Cummins Diesel
2002 Harley-Davidson Fatboy
Merlin Extralight w/ Campy Record