Currently a new brand the Neewer has came to the market being one of the most affordable professional follow focus and its work as well as the more professional ones. And currently being only 37USD its quite affordable unlike the other brand like Fotga which be closer to double this price and from more bigger brands you would be looking at several hundreds of dollars.
If you are interested in buying this item, its actually now also available on Ebay here:
Neewer Follow Focus CN-90F
However the seller has set it to be only sold to US, but you could still try and send them an message if they are willing to send to your country if you are living in other parts of the world.
However you only get one gear with the set, but on Ebay you can pick up a gear for around 5USD. To find those click this link: Follow Focus Gear
And now you have a quite affordable professional set and also more money to spend on more Follow Focus gears to put on all your lenses for quicker lens changes.