A view years ago, a 32 channel EEG board started selling for 600 – 700 USD on Aliexpress. https://www.aliexpress.us/item/3256802367049230.html?spm=a2g0o.productlist.main.29.2f92XQwYXQwYjr&algo_pvid=ffc8ce7f-c128-4055-a857-83d81830ff96&algo_exp_id=ffc8ce7f-c128-4055-a857-83d81830ff96-14&pdp_npi=4%40dis%21CHF%214884.08%214542.19%21%21%2140000.66%2137200.58%21%40211b815c17253755667742981eb359%2112000021112695409%21sea%21CH%21777421489%21X&curPageLogUid=FUNbDfI6K9rV&utparam-url=scene%3Asearch%7Cquery_from%3A&gatewayAdapt=4itemAdapt The price where about the same as the electronic components would cost to build a 32 channel EEG device based on InfluxDB, which is around 600 USD. Peter Gamma from www.petergamma.org mentioned this board several times …