I'm looking to get 10 units of the foam and plastic (almost like ski googles) insert that pops in and out of the larger headset. Why? We have an Oculus at the office and it is DISGUSTING to wear a sweat soaked Oculus headset after someone else. The insert (again it's just the insert that has the foam padding on it) pops out of the larger lens case. I'd like to buy 10 of that component for everyone in the office to have a lot less disgusting Oculus experiences. It takes several hours for the Oculus to dry out from sweat. No, we aren't using it conventionally. I'd share how we are but that would be several more paragraphs.
Since Oculus currently does not offer faceplate replacements for purchase, your best alternative is probably VRCovers, as the above poster mentioned.
If you want it quicker, it looks like Amazon carries them now. Otherwise, ordering from VRcover directly could take weeks to get to you, depending on your location, of course.
There are many reviews that VRCovers provide much better comfort and longevity than the original Rift face plate. I'm still waiting for mine to arrive, but there are plenty of good reviews floating around.
And separately, or additionally, you may also consider disposable facemasks as an option. You can do searches for "VR Disposable Face or Eye Masks". Here's one example: