Hi
Well you can use cheaper peroxides but last month we renewed our insurance for the shop and we had to go into real detail, and i was quite shocked about the legal side of developers, for example if you use Matrix color and matrix developer you are Covered but if i use matrix color with a lesser known brand your insurance is invalidated !!! if that customer has a reaction even if you do a skin test, the insurance company will take tests samples form tint brushes and the hair of the complaint and will swab for tests, as they had a salon recently who did this and it was a costly mistake that cost them £28,000.
If i am being honest we did use a cheaper peroxide and got results but now we are on proper peroxide the color is more radiant, shinier, last longer and makes my work look tons better. so it is a small price to pay to be a professional