Prices are influenced by many factors, with purchasing conditions playing an important role. Regarding the current purchasing conditions, we cannot set the price lower, I'm sorry.
(as of 2020-06-01) Check https://www.pi-shop.ch/raspberry-... - CHF 84.90 and available immediately.
Officially, the 8GB Raspberry Pi 4 costs USD 75 according to the Raspberry Pi Foundation (in CHF, today, 2020-06-01, i.e. CHF 72.04, see https://www.raspberrypi.org/blog... ). At digitech.ch therefore about 20% (= ( 89 - 72.03 ) / 89 = 0.19 77 ) more expensive ... 🙃