Odroids are consistently more expensive than nearest Raspberry equivalent, older Orange Pis (Orange Pi Zero) are even harder to find that RPi Zeros! "Harder" is

Odroids are consistently more expensive than nearest Raspberry equivalent, older Orange Pis (Orange Pi Zero) are even harder to find that RPi Zeros! "Harder" is the wrong word - Orange Pi Zeros are impossible to find. The upcoming wifi cam from Pine64 is the best-next-thing to the RPi 0 for my use case and price range, but its not yet out. For now, nothing beats the RPi 0 on price, as well as features-per-dollar. The closest is an Onion M2, IIRC. It's $9 before shipping, but only has 64MB memory. I'm prototyping /piloting on RPi Zeros, but if I end up scaling to 1000's of sites (which is why I cant use a $200 SBC per site. It's a self-funded passion project), I'll likely have to switch to the Onions due to the limited availability of RPis you mentioned