What's a fair 40 volume developer price right now?
If you're staring at your roots and wondering what a fair 40 volume developer price looks like today, you're definitely not alone. It's one of those things where you go to checkout and suddenly realize that the bottle costs twice as much as it did three years ago, or you find a gallon for a price that seems almost too good to be true. Whether you're a seasoned DIY hair pro or just trying to lift your dark hair to a pale blonde for the first time, getting a handle on the costs—and why they vary so much—is the first step toward a successful hair day. ...