A good used workover rig (single) including rig tank, rig pump, doghouse, and rig tongs can be had for around $1 Million. A good new work over rig (single) including all the aforementioned stuff is ~$3 Million. I don't know how much more a double or triple would be, but I'm guessing in that same ballpark. A new drilling rig is in the $10 Million range, although you can get used ones for far cheaper.