I've put a matt (= non glare) screen protector foil on it after receiving the DPT-S1. Best option :-)
Surprisingly it was available in Germany:
https://www.amazon.de/gp/product/B00...?ie=UTF8&psc=1
I've bought a few things from bhvideo.com a few years ago without any problems. If I need a new Sony DPT-S1 I would instantly buy it from bhvideo.com.