I don't think there were such big price fluctuations. Many people bought the device and then resold it via Digitec. I myself bought the device through a reseller. I suspect that many returned the device because the Google services are not available.

Because the standard Android and therefore Google Play does not run on it... but in the meantime various people have discovered that Open Android runs equally well and with the APK Pure app almost all apps can be installed (even Google Earth runs); at the same time, since it is not installed via Google Play, no data is sent to the data octopus Google when each app is started, used and closed...
Greetings

I don't know, you'll have to ask Digitec.
Greetings