Amazon.com: hylissus 2 Pack Square Slot Cutter Drywall Oscillating Tool, Stainless Steel Drywall Outlet Cutout, One Step In Place Electrical Box Cutter for Drywall, Plastic Metal, Wood (Rectangle + Square) : Industrial
Qbit SQ1000-S Stainless Steel Cut Outs, Magnepull QBit Outlet Square Slot Cutter Box for Oscillating Power Multi-Tools to Cut-in Single Gang Wall Boxes, Wood Cutter Drywall Tools for Home Improvement - Amazon.com
Electrical Box Cut-Out Saw for Oscillating Multi-Tools
QBit Oscillating Gang Box / Outlet Saw
Jonard Tools EBW-812 Electrical Box Cutting Kit, Double Gang in the Oscillating Tool Accessory Kits department at Lowes.com
Electrical Box Cut-Out Saw for Oscillating Multi-Tools