Phil,

The best supplies of wiring and cable in bulk is usually local electronic stores, however, not Radio Shack. Their cable prices are out of this world. Internet supplies are usually not very expensive, but because cable is heavy, shipping cost are usually expensive, thereby, making the cost per foot very high. Look in the phone book's yellow pages under electronic parts or supplies, and also under wire. Then make a few phone calls and compare prices.

Good luck on your project and keep us posted about your progress,

Gary