Replaced a dual-coil immersion chiller that probably cost... cripes, probably somewhere between $50 and $80, between the cost of the tubing and all of the fittings that I had to get from McMaster.
60' 1/2" copper $27 Home Depot mgr wanted it off the shelf for new stock.
Couple of bucks for assorted fittings.
Screaming at wife to hold the coil still while I wrapped it around the keg (priceless)