In Berlin now there are about 19 TTIG s registered. And: numbers are growing. Students will arrive on 2nd of October 2019, so we can expect further growth.
Sometimes you may buy some, sometimes they are sold out: https://de.rs-online.com/web/p/products/1843981/. If you don't have a VAT ID you may buy there: https://www.rsonline-privat.de/Products/ProductDetail/The-Things-Industries-TTIG-868-Entwicklungssystem-1843981
The OSmap below is showing the TTIG s inthe City of Berlin and the areas near the german capital. That's nice. They will fill the radio holes..... step by step.
Also the total numbers of TTIGs are growing rapidly, worldwide, as the next slide will show you.
More stats over time here: http://bit.ly/ttn_stats