Have you tried looking much? There's actually a fair bit of choice, and has been for the past few years, with many quad-core ARM based Pi competitors in the sub $100 market these days, all using various mobile phone style CPUs:
The reason you don't see them all that often is that none of them have close to the popularity of the Pi, and therefore don't have nearly as good community resources. The Odroid boards seem to have fairly active Reddit communities from what I've seen, but haven't tried using one personally.
> https://all3dp.com/1/single-board-computer-raspberry-pi-alte...
The reason you don't see them all that often is that none of them have close to the popularity of the Pi, and therefore don't have nearly as good community resources. The Odroid boards seem to have fairly active Reddit communities from what I've seen, but haven't tried using one personally.
> https://www.hardkernel.com/main/main.php