You can't buy those parts, you'd have to find an engineer friend with free time and a rift on ebay or something that they could harvest parts from and just hope they have the skill to repair it. 3D Printer forums are full of engineers that might be able to do this type of work, weather they'd want to do it or not.... I don't know.
You could always try opening a support ticket to see what they say.
You can get protective lenses here (just select the NON prescription option) http://vr-lens-lab.com/lens-adapters/
As for replacement of lenses, here is a complete teardown by iFix it https://www.ifixit.com/Teardown/Oculus+Rift+CV1+Teardown/60612
As you can see not an easy feat. Looks like the Fresnel lenses are glued to the black frame.
Can I ask how did you manage to damage the lens? With proper use, I don't see how they can get scratched. Had mine since pre-orders and not a single mark.
So I have a scuff Mark that’s on my right eye lens, it’s not really that big of an issue at the moment but I’m wondering if you’re able to replace the lenses. I cannot find any lens protectors and if you can’t change the lense or have them replace for a fair price that is pretty outrageous. I hope you’re not telling me if I scratch up some $30 Lenses that I need a new $400 oculus rift.
Does anyone know if they can be replaced for a fair price or a website that makes good lense protectors, because amazon sells nothing good for this.