www.cabelas.com lists a Maier plastic skid plate for about $45.00.

 

I had a Maier belly plate on my 450ES, and it worked very well. It's light, but it's tough. It stood up to a beating over rocks and logs, and only came away with a few scratches. For the money, you just can't beat the protection. I'm waiting for them to come out with one for my Rubi now.

 

check out ATV Charlies and I think you'll find what you are looking for. I have one of their skids on my 300 and absolutely love it. Can't imagine how I did without it for so long. Also, as said earlier, they are a snap to install.
http://www3.ns.sympatico.ca/atcharleys/