For oils, you only need a pea-sized amount on your ends (rub the residue oil over the rest of your hair) so the product always lasts you a while!
I use Verb Ghost Hair Oil and it always makes my hair easy to comb. It also makes my ends look nice! It's so lightweight that it pretty much vanishes as soon as I put it in my hair, so my hair isn't oily and there's no residue left behind (love that). It also has a light citrus scent that's so lovely you'll be sad when it disappears.
Promising review (for Verb Ghost Oil): "I have very fine, dry, and damaged hair from years of bleaching and dyeing. I’m trying to go natural so I've been looking for anything to help soften and prevent breakage. I usually hate hair oils, and feel they make my hair sticky or greasy even only using a few drops. With this, I never have any issues! I use two drops when my hair is damp and spread it through, then one more drop mostly on the ends after styling. My hair looks glossy and is super soft. Never a greasy residue! Very lightweight, and I love the scent. Really can’t recommend it enough for fine hair. It seems like you can never use too much!" —tempestrune
Get Verb Ghost Oil from Amazon and Sephora for $18, and the Shu Uemura Protective Oil from Amazon for $44.97 and Sephora for $28+ (available in two sizes).