Wow...that's way too much. Of course, I'm talking about basically four pieces of angle iron with wheels on the corners. There are holes/push in detents that allow the size to adjust, but it's nothing fancy. Oh- and this is for my Dewalt saw that's basically a stand saw. Most of the contractor ("Roll Around") saws I'm familiar with have folding legs with wheels on one side.Please do. The one I found was over $200. I don't want to spend that much.
My saw is really just on a fancy dolly. And you can step on two pedals to lock two of the wheels in place. That's been good enough to push full sheets of plywood or 8' long 2x's through the saw without it trying to roll around.