Here's not only a used gimbal but a very good source to buy from. I bought mine used and it's hard to tell that it wasn't a new unit. Their closed on Saturday but you still pay for it and it will be shipped on Monday. Used DJI Zenmuse H3-3D 3-Axis Gimbal for GoPro CP.ZM.000061 B&H
I am a newbie here so I can't vouch for the fit but it looks like it's probably gonna come from China so it may take a few extra days, if that matters. Also the reviews are a little strange: the second one says the board burned up but still gave it 3 stars and the next guy (in another language) seemed to have some kind of complaint that Banggood had to apologize for and he still gave it 4 stars. Then the next guy says it's shaking all the time and he gave it 4 stars. I would say save your $50. It's too bad your Zenmuse went bad. Doesn't somebody fix these? Again I am new. 3 weeks ago I had never heard the words atti, naza, 3 Black, 3+ Black, FPV (okay I heard that one), Zenmuse, and today I own most of them. I hope you find something in your price range that does what you need.
You'd be better off with a three axis gimbal vs a two axis gimbal. Some complain that using the three axis is that they see the left landing gear then they yaw to the left which is true when shooting in the wide or medium modes. The other complaint is the props in the video when flying forward at higher speeds but that will happen with two axis gimbal as well.
I have used both zenmuse gimbals and decided that changing the cameras stock lens was a much better option. So with 5.4mm lens I no longer have any fisheye (which I hate) and no props or landing gear in the video footage to crop out.
