The official is cheapest 113€, the other cheapest 50€ (in Germany).
113€ "COMPUTE MODULE IO BOARD V3"
https://www.raspberrypi.org/products/co ... -board-v3/

50€ "Compute Modul IO Board Plus for CM3 und CM3L"
https://www.rasppishop.de/Compute-Modul ... 3-und-CM3L
