Best place to find replacement glass panel?

I have a friend that wants a 15" MacBook Pro glass panel replaced. I have done the repair before on my own device, but had a couple problems with dust. I'm looking for a good quality replacement panel that is absolutely clean. I definitely don't want used, and preferably it should be something with dust covers put on the panel that I can peel away before putting it on. iFixit doesn't sell this panel, and eBay and Amazon are sketchy sometimes. Does anyone have a good source to find high-quality replacement panels?

(Also, I'd prefer a real glass panel but I can live with a polycarbonate one if that's all that's available. No need for preinstalled adhesive strips either :) )

Odd request but it would be great if anyone has info!

Thanks so much!