3d mice

At work I have a 3d connexion space navigator, and I love it. It makes navigating in my CAD space so much easier. I am thinking about getting one for my personal use, but I was wondering if anybody knows of a generic model. One that isn’t $100+. In my opinion I think its 100% worth the investment, but I’d kick myself if I bought it and then learned of a cheaper model.

The Space Navigator really is the cheapest option. 3DConnexion doesn’t have any competitors in the market, unfortunately.