If you're looking for a solid slider to add to your kit so you can get some of those buttery-smooth moving shots then you'll definitely want to check out Konova's slider.
This slider has received loads of favorable reviews for it's build quality as well as it's affordable pricing ($320 will get you a 24" set and the they also offer progressively longer runs all the way up to 48" for about $420). Pretty solid purchase if you're looking for an alternative to $1,000 sliders.
Also worth nothing is Konova's array of adapters coming out to add features like a drive belt, handcrank and later on even a motor. Check some of the product vids below for a closer look:
All told you get a very flexible piece of gear of a very decent price so the Konova slider is definitely worth looking into if you're in the market