After we reviewed this OpenBCI Ultracortex Mark Series compatible EEG cap: https://de.aliexpress.com/item/1005003432011498.html?gatewayAdapt=glo2deu in our journal, the price for it was increased from around 200 USD to USD 305 which the EEG cap is now. Did you ever see someone using this cap? And is this cap really worth USD 305? The single components of EEG …