CopperTubingSales.com :: ICS Indsutries ::
is the best place to find a good price for copper tubing. If I may, I would like to sway you to the RIMS dark side. A 1500W element will allow you to recirc on a 15A circuit and you won't have to worry about $50+ worth of tubing.
The box of miracles compels you.
BTW-Sorry for not answering the PM, a local craft brewery and a home project has taken both my soberness and my time, respectively.