`lnd` on Raspberry pi zeros?
One node to rule them all and in the darkness bind them

Run a Raspiblitz (EUR120) 
https://github.com/rootzoll/raspiblitz

Then run slave devices on ESP32 (EUR5) 
https://github.com/musdom/sploony
https://github.com/arcbtc/1.21

121 would need to be ported with macroons