A couple months back someone posted a pretty cool controller they had built which used a wireless link to feed gyro data from a remote handheld device to a Alexmos/Basecam gimbal controller... It was obviously targeted at the higher end film-maker space, and had a pricetag to match - but it caught my fancy and I had already done a bluetooth gamepad controller for gimbals, so I figured I would give it a shot.
All in all turned out really well and costs well under $50 to build - while it is more complicated than my last controller to build, if you've got some background or experience with electronics and a soldering iron, and a free hour or two, you should be good to go. Here's a video showing it in action, and giving all the details on how to build one yourself: