I have a homemade counter flow chiller made from garden hose and copper tubing with soldered fittings. It is about 20' long. It works great and is pressure tested. It has never seen actual use, so it is new (made from extra copper from the first one I made). I would like $35 for it (less than the materials cost). It is located in Littleton, CO. Please PM if interested, and I can email pix.