Camera sliders and dollies, designed to help you film butter-smooth video while the camera is in motion, are quite pricey. This DIY version uses extremely cheap parts, like skateboard wheels, to keep the cost under $US50.
In the above video—one of the most entertaining DIY videos I've seen in some time—photography enthusiast J.G. Pasterjak demonstrates how to turn skateboard wheels, angle iron, and basic hardware store parts, into a smooth gliding camera dolly. The best part about his build is that it isn't locked into a commercial track system. You can use all sorts of tracks and even take it off the track and roll it along any flat surface.
Watch the video to see how it is all put together and visit the link below for a parts list.