RIDGID 18V Drywall Cut-Out Tool R84730B - The Home Depot
Mini Circular Saw Set, King Showden 400W High Powered Professional Compact Circular Saw Machine with 3 Blades and Tool Box Multifunction Circular Saw for Cut Drywall, Tile, Metal, Wood - Amazon.com
Wal-Board Tools 6 in. Jab Saw with Rubber Handle 004-030-HD - The Home Depot
6 Best Tools for Cutting Drywall (According to the Pros)
Straight cuts on drywall are a snap - no power tools needed