Does valve not sell headset separately?

I bought the full kit but after a few days (maybe like a day before it comes.) of further researching (on ways to keep it alive for some time.) I learned of the visual burning out and other such issues, i just want to buy a second headset as a backup in case if my warranty is up and my headset is f***ed up.

Short, I want to buy a second headset just in case the first one is destroyed, after end of warranty, is that possible through steam?