George, I find it, at times on Ebay. This guy will sell as short as an 6" length for $45, but it is thick wall 3/8".
http://cgi.ebay.com/COPPER-PIPE-TUBING-3-8-WALL-X-4-OD-X-1-LONG-/250464267555?pt=LH_DefaultDomain_0&hash=item3a50d56d23
Don't see this very often, to bad it's been messed...