I would suggest as the starting point to look at sigrok's supported hardware table[0]. I personally own a bunch of the cheap 8ch 24Msps saleae clones, which ar

I would suggest as the starting point to look at sigrok's supported hardware table[0]. I personally own a bunch of the cheap 8ch 24Msps saleae clones, which are typically below $10. I would recommend the one from muselab as it has open sourced its design. The next step, the DSLogic, of which I have a 200Msps 16ch model. 0. https://sigrok.org/wiki/Supported_hardware https://sigrok.org/wiki/Supported_hardware