When it comes to throwing a spare fluid head onto your DIY slider, Spidertrax Dolly, or other DIY tools, there's nothing with the quality and price as the 717AH Video Fluid Head. When I first found this cheap video fluid head it worked perfectly for my little projects. You can find my little over view video here: https://cheesycam.com/hidden-treasure-awesome-video-fluid-head-717ah/
Within just 4 hours of my post the entire inventory was sold out, and has been for months. Other vendors of this head were charging quite the premium, and at that cost you've got alot of other options for Video Fluid heads. So if you're looking for a decent sub $80 dollar fluid head to throw onto some of your DIY projects, check out the 717AH Video Fluid Head which I anticipate will be again out of stock within hours of this post.
Available via eBay for $79.99 found here: 717AH Video Fluid Head
Or available via Amazon for $74.99 found here: 717AH Video Fluid Head