FreeEEG32, affordable, stackable, open source, 32-channel EEG ADC powered by a Cortex-M7

https://www.crowdsupply.com/neuroidss/freeeeg32#details-top

https://www.pcbway.com/blog/Activities/32_channel_EEG_ADC_with_Cortex_M7_____FreeEEG32.html

added 11.9.21

Free EEG32 32 EEG Channels for $199

FreeEEG32OpenBCI CytonKT88-3200Mitsar 202
MicrocontrollerSTM32H743PIC32MX250F128B
Channels3283232
Resolution (bits)24241224
Max Programmable Gain Amplification (PGA)8x24xUnknownUnknown
Open SourceYesYesNoNo
Price (in USD)$199$500$1000$10,500