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

	FreeEEG32	OpenBCI Cyton	KT88-3200	Mitsar 202
Microcontroller	STM32H743	PIC32MX250F128B	–	–
Channels	32	8	32	32
Resolution (bits)	24	24	12	24
Max Programmable Gain Amplification (PGA)	8x	24x	Unknown	Unknown
Open Source	Yes	Yes	No	No
Price (in USD)	$199	$500	$1000	$10,500