Electronics - sparkfun.com

- A great company located in Colorado that has every little electronic gizmo you could need. They are helpful and full of ideas to get you going.

 

Tractor Supply Company

- Tools and hard to find parts.

 

Northern Tool & Equipment

- Parts and equipment.

 

Google SketchUp

- FREE!- An advanced CAD program that anyone can learn to design your perfect 3D, to-scale, trebuchet.

Tools of the Trade