Keep an eye on eBay ( DJI vision gimbal board ) as your search, they pop up now and again for aroun $100
But it's a gamble if they work, I bought 1, no go so seller sent another ( no go ) 3rd one worked!
Or
Call this guy:
Mike Holtz
530-277-5366
( tell him Jerry from Florida sent you, he can help ) a bit more expensive but garanteed to work!
Hope this helps
J Dot