You can pick up the CamOnWheels for $20 on Ebay. It looks like the most stable option would be on the PVC pipe. One major drawback I see in a lot of these DIY videos is the assumption that little urethane wheels are going to stay stable. On anything but the most optimized surface, wheels like that are going to generate vibration. However, for twenty bucks, plus something to screw them on to, and some pvc pipe… that’s a pretty cheap dolly. Have fun on this DIY Friday.