Lane, I have a Pulsatron adjustable chlorine injector pump. This unit is about $350.00. It sits on top of a 20 gallon plastic tank. The pump pulls a 10ppm chlorine mix from the tank and injects into the water line. The injector nozzle and the pickup check valve and screen in the tank are $60.00 each and are made from a nylon composite. I will need to check this for sure but the manufacturer is CUNO, they are located in Indiana. You should be able to get this unit from a local pool suplies distrubutor in your area. You can use either pool chlorine (12%) or Clorox (6%) to mix the injectable. If you have not used one of these before you need to know you have a lot to learn.
Try the Water Source at http://www.thewatersourceltd.com/index.html
Good luck. ric