I had a hard time finding a source of good shielded cable for stepper motors and limit switches in anything less than 500 ft spools. I finally a source of good reasonably priced shielded cable in lengths that I could use. DIYHomeTheaterSupply.com has shielded 16/2, 18/4, and 18/2 cable in 1 ft increments (10ft minimum) or 50 ft increments. Go to Speaker Wire In-Wall|CL2/CL3|Speaker Wire|Speaker Wall Plates|Acoustic Foam|Direct Burial Wire| and click on Shielded and Direct Burial Wire Sold by the Foot in 1ft or 50ft Increments (Specialty Cable) under Home Theater Accessories in the left hand column. The cable is of excellent quality.
Shielded and Direct Burial Wire Sold by the Foot 1ft or 50ft Increments
Shielded and Direct Burial Wire Sold by the Foot 1ft or 50ft Increments