This is a dolly my Dad and I built. He doesn't know what the prices are and is just making stuff up :-). The total cost was about $50 for everything. If you have any questions about it let me know.
I was inspired to build this by the guys over at pond5 in the forums. I saw some results they showed and was amazed by what a little amount of movement can do for a video!
Also visit my stock footage site while you are at it ;-)