I've seen these wagons advertised for as little as $50.
http://www.youtube.com/watch?v=OGLraFEbmCY&feature=related

Or for a few more bucks, there's this one:
http://www.youtube.com/watch?v=2IWZvBHnmJI&NR=1

I have a minimal setup: L1 compact, gear bag, x-stand, x-seat and keyboard in a soft case. I use an RR10 cart and love it, but this got my mind to thinkin'...
Has anyone tried one for their equipment? Any reviews?