Comment by CamperBob2
4 hours ago
Part of what you're paying for with the ADS1299 is simultaneous sampling, which you can get by without. You could use a single-channel 24-bit ADC and multiplex it yourself with generic analog switch ICs. That gives you a much larger array of part-selection options.
Or try the newer ADS122S14.
The ADS1299 also has a bunch of built in analog front end circuit specifically for biosensing. Though it looks like the could be used for a super cheap EEG, neat chip and in some ways, better than the ADS1299.