Originally Posted by Bobby_M
I think coppertubingsales.com is the best deal going if you compare final price shipping vs. sales tax locally. If you ever plan on going 10 gallons, the best deal is 1/2" x 50' refrigeration tubing.
I used 3/8" copper from coppertubingsales and was very pleased with the ease of ordering, the price, and the delivery. Not sure if the 1/2" is better, but you really should check that place out for tubing. You do want the refrigeration tubing.