This is the most affordable version we could find: https://de.aliexpress.com/item/33022723890.html It is a pitty, that the Aliexpress Shop2956052 Store does not stick to the unspoken rules of open source hardware: Soapbox: The {Unspoken} Rules of Open Source Hardware We observed that costs for EEG components fluctuate strongly on Aliexpress. For instance for this EEG cap: …
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