http://www.tubeservice.com/

Not sure if they have one near you but that is where I order all my stainless hardline from. They only sell them in 20ft or 24ft sticks though depending on the tubing. Last FC I did only used about 14ft to do from the tank to the firewall and a cross over from the the two rails.

Also make sure you order seamless tubing otherwise when you flare it, it will split. I use .035 wall seamless, I ran 1/2" and 5/8" in my personal car.

 

The tube I was looking at from Jegs is from Nitrous Express, overpriced I know, but since I am in Canada I need to buy as many things from one place or else I waste time and money on shipping.
Doesn't say if its seamless or not though..

 

You can buy 8ft sections of tube from onlinemetals.com. It is cheap to ship that way as well. That may be a good option for people who are not close to; or have a way to transport long straight tube lengths.

Also, I agree with the above RE: coiled tube...... forget it, you will not straighten it unless you have special equipment to do so, especially if it is stainless.

 

Just saw their ad on ebay, good pricing too.