http://www.sportsimportsltd.com/traccleatans.html

The second ones work great for $15. I kept a pair on our coat rack at work until someone walked off with them. Before getting cleats I fell once on a fairly steep slope, hit the back of my head on the concrete, and slid under a parked car. Luckily I was on my way to my neuro and he checked me out and said I was okay.