Greentek EEG caps in the Aliexpress Hunan Dream Star Creative 1 Store:

https://www.aliexpress.com/item/1005004496506618.html?spm=a2g0o.productlist.main.29.5808pzpCpzpCGO&algo_pvid=aae1f2ec-0f9a-4fde-a415-03d5960fd978&algo_exp_id=aae1f2ec-0f9a-4fde-a415-03d5960fd978-14&pdp_ext_f=%7B%22sku_id%22%3A%2212000029363037142%22%7D&pdp_npi=2%40dis%21USD%211100.0%21880.0%21%21%21%21%21%402102196716734349911262496d06c2%2112000029363037142%21sea&curPageLogUid=Wbls1oUQqMkH

Costs for Greentek Gelfree S3 EEG cap in the OpenBCI USA store and on Aliexpress

Greentek EEG cap in the OpenBCI USA store:

Gelfree BCI Electrode Cap Kit

In contrast to Greentek Sensors, Tenocom medical has their own store on Aliexpress under their own lable:

EEG caps & EEG accessoires from Tenocom Medical

https://www.aliexpress.com/store/5626179