Just wanted to share a local source I've found for some metal spiral pipes here in Atlanta. After searching for months with no luck, I started to get shipping quotes from different online vendors and they were all pretty much the same. Shipping cost were nearly as much as the pipes themselves. I got lucky when one company I contact told me shipping would be high and that I should try a company called Conklin Metal Industries. They stock 6" 26ga spiral pipes in 10' lengths but can cut it down to 5' for you if you want at no charge. I ordered 30' of pipe from them for a total of $130 including 3 couplings and taxes. They also sell fittings as well but I ended up ordering those online.
Hope this helps other members in the future when looking for ductwork locally.