White paper - Coin cells and peak current draw
201 KM by Andreass Spiess - congratulations !
They took the page offline?
No, the (Dutch) page is online but maybe you were redirected to a non-existing English version (due to your browser language or location). Here’s a capture; click to enlarge.
I think the prices are per node, but MAYBE the prepaid can be used for multiple nodes? “Maandelijkse kosten” and “Kosten per maand” are cost per month. “Aantal per eindklant” is “number per customer”, and “buiten bundel” is when you exceeded the included numbers. “Activeringskosten per key” is activation cost per key, and “Eenmalige kosten” are one-off costs.
Well, Google Translate helps. 
BLOG TIP 1 : https://www.disk91.com/
BLOG TIP 2 : https://blog.adafruit.com/
Mini Solid-State Battery Powers IoT Sensors
How to Install Windows 10 IoT Apps on the Raspberry Pi
Open Connectivity Foundation aims to standardize IoT devices
