Are there any places with raspi in stock or any alternatives?
I feel that people are being quite snobbish about only wanting to use a Raspberry Pi, when for a lot of IoT scenarios clone boards would work just as well when Pis are hard to find, or too expensive.
I would not recommend a clone board for general desktop or server computing though.
Check this, updated often - https://rpilocator.com/
BananaPi