It is Jobu and have had one for over 10 years and happy with it. But costs somewhat more than the OPs budget:
The Jobu Jr.3 gimbal (BWG-J3K) is smaller, lighter, smoother and more compact than our earlier BWG-J2K head. Needle roller bearings allow smoother tilting under heavy loads and better adjustment of friction. Lockout force has been improved 200%, and overall durability has been improved in all...
www.jobu-design.com
My photo buddy uses the Jobu Jr 3 and is happy with it. He uses lenses in size up to the Z 600mm pf with tc.
The one question that I have about this unit concerns the ability to adjust the vertical height of the lens.
The advantagte of a true gimbal over other types of heads is the ability to balance the lens/camera precisely. When perfectly balanced you can let go of the lens/camera and it stays where you left it without having to tighten anything. If you are looking for a shot and are for waiting for some action to start, this allows you to wait comfortably for long periods of time while being able to jump in immediately when things start to happen. You don't have to loosen a knob to start moving the gimbal.
As I understand it, this sort of precise balance can only be had with a gimbal that mounts underneath the lens. I think this side mount versions can't do that but somebody may know more about this than me.
To adjust a gimbal precisely you first need to start by getting the vertical center of gravity of the lens/camera to the same height as the rotation point. This generally means adjusting the height of the clamp vertically to align the center of gravity with the rotation point.
Once you have the vertical position you then adjust the fore-aft position of the lens int he clamp so the lens does not tilt either direction when let go.
When the balance is dialed in precisely the lens/camera moves smoothly and effortlessly in any direction and stays where you point it when you take your hands off. No need to tighten anything to hold it in place.
As an academic point and solely for completing this analysis, I note we live in a three dimensional world and there is the potential for a third adjustment. The gimbal I have been discussing adjusts vertically and front to back, but does not adjust in the third dimension, which would be side to side from the perspective of the camera operator.
The only gimbal head I am aware of that provides full three dimensional adjustability is the super expensive Really Right Stuff PG-02. Its vertical arm can be adjusted in or out.
To my understanding this third dimension adjustment is only helpful for panoramic shots. With those parallax can become a problem because closer objects shift position as the camera is rotated. Reportedly the RRS PG-02 allows you to balance the parallax axis of the lens precisely over the gimbal rotation point so parallax shift is eliminated.
Of so I am told. I am not an expert in this stuff but I read a lot.