Single board computer support

[jashugan]

Hello,
what is, in your knowledgde, the single board computer that has the lowest price provided it has a good support? For good support I mean it has the device tree support to build uboot without building from source files.
Minimum requirements are:

• Cortex start from 1GHz
• Wifi or Ethernet
• LCD or Mipi interface
• better if it has the 2G/3G module
• better if it has embedded RAM and/or Flash

[NiHaoMike]

You can try to find a cheap smartphone that's supported by LineageOS, but the developers don't even seem to bother with the super cheap ones nowadays - a $50 phone takes about the same time to hack as a $10 phone but ends up with much better performance. I'm not aware of any cheaper way to get a cellular radio that supports modern networks - 2G is basically dead and 3G is being phased out.

If you don't need cellular, Raspberry Pi Zero is hard to beat for the low price.