If there’s one thing about camera mounts, it’s that standard run-of-the-mill tripods can be found for pretty cheap but once you take a step into the elaborate realm of steadicams or any other professional mounts that do more than just set the camera at a certain level, prices can get quite high.
Cristophe Caron details how he built an in-car camcorder mount with about $15 worth of materials. It basically amounts to an aluminum tube that fastens to the passenger side headrest with U-bolts and wing nuts. The resulting video (see above) is surprisingly smooth, much more so than having someone in the car holding the camera. Here’s a PDF file with more detailed instructions.