I have a cheap threader ($29) from our version of HF (Princess Auto) it worked out well for my air line installation. I figured it would cost me $3 for every threaded end I needed from HomeDepot not including cuting down to size, cost wise it worked out.
Just remember to use plenty of oil, you don't want to make dry cuts. Lots of pressure while making the threads also. My lines work out to be around 60ft also.
The onr thing with PA, even though some of their stuff in made in China.
They have a 100% satisfaction gaurantee, I could use and abuse the itam for as long as I like then return it for full refund. No hastles or questions asked.