First thing that comes to mind is Dillon Supply...
http://www.dillonsupply.com/
They have a Raleigh and Durham location. The sell in minimum sizes. So for example if the minimum length is 10', then you would buy a 10' section and cut to length at home. They will do some cutting for you (not super accurate).
If you don't want to buy a large section, there are plenty of online places that will sell you cut-to-spec material. Those can be a better deal on very short or odd sized stuff.
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Richard Casto
1972 Porsche 914
2013 Honda Fit Sport
2015 Honda Fit EX
http://motorsport.zyyz.comMoney can't buy happiness, but somehow it's more comfortable to cry in a Porsche than a Kia.