Quoted from mulder2010:I get these from Amazon. The machines don't move as much as you might think with these under the legs. They kind of settle into their place and remain stationary.
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These are absolutely awesome. Perfect for carpet or wood or tile floors. I can slide my pin by myself on these out of my carpeted game room, through my tiled kitchen, over my hardwood floor to my back door where I can cart it away.
enough for 4 pins:
http://www.amazon.com/gp/aw/d/B001W6Q4W4