I purchased this Dubby tablesaw crosscut sled system (both Right and Left sides) several years ago but never took them out of the box or set them up. They have been stored indoors since purchase. $285 for both.
From the manufacturer:
THE ORIGINAL DUBBY SLED: From standard 4 sided panel cutting to the absolutely stunning heptagon frame you will be completely accurate with the angles on your mitered projects with the Dubby Sled. The Dubby will allow you to make perfect cuts the first time you do them and keep your creative juices flowing with idea after idea. It is ideal for making frames but it also works very well for the cutting of tiny pieces while keeping your fingers out of harms way.