It was not so hard finding one. I got it from the Pi Hut because now and then they get a shipment and via their newsletter the word is spread. Actually, they seem to have it in stock right now. Just pick the "Just the Pi Zero" option to avoid all their extras Here is the link https://thepihut.com/products/raspberry-pi-zero?variant=14062715972

@epierre said: I had the contact with this seller, but an international money transfer was needed and is expensive... yeah, they also have a minimum order quantity and ship with DHL only, so you have to pay import taxes to EU so it only makes sense if you order a big quantitiy and then try to resell it somehow all in all a hobby that at least has some return on investment, compared to other ones i had :)) You're courageous th have gone on kickstarter, from memory seeedstudio nearly went down because of an error on a crowdfunding project and had to produce and ship (the more expensive par of it) a remlacement for the first batches... ahh .. i didnt know this about them... and in their scale - i can undertand it happened to me as well but in my scale it was rather a paid lesson :))))

Did you guys managed to have it working with latest mysensors version?

@skywatch thanks a lot for offering to help. I think I have made some headway. I used @NeverDie sketches. The one for nrf24 or RFM69 don’t really work well with waking up the nrf51 chip or maybe I made some mistake and were consuming way too much power. Anyhow , the test sketch is running and interrupts are working fine as well as the bme280 reports fine. Tomorrow I will move it a battery powered and observe. Cheers!