Came across this gimbal for the Solo 3dr quadcopter. Very good price for it if you happen to own the ~$1500 drone. Looked on a couple of forums and seems you cant use the gimbal separately or on another type of drone but might be worth a try given the very good price (let me know how you go cause i would be very keen on trying it).
RRP is $400 on videopro's website, also listed for $400 at Harvey Norman.
There are some cheap $50-60 gimbals available on ebay but they are only 2 axis compared to this one which is 3 axis.
Thats an insane price considering i paid over $600 for mine from Harvey Norman.