Here is a build thread for my ZoomCam, you can build it without the mounting part, and carry it around, and it will protect your camcorder from hits no problem. Just turn it on before the game, and leave it closed up while they are playing. Cost of parts is around $20.
You can leave the side door clear plexi so you can see the viewfinder when you look at the side.
I've taken tons of hits to this with no problems, just check the lens plexi after every game, as a single smudge of paint will ruin your footage.