FYI, those appear to be the v1 revision of those switches (based on the two-color housing). There are also v2 and v3 versions available (those are all-white opaque housing and all-white translucent housing, respectively). See some notes that left here: Silent tactile switches - #73 by yeeb
You can find these switches from multiple AliExpress sellers. For example: https://www.aliexpress.us/item/3256804838558138.html (original v1 colorway) and https://www.aliexpress.us/item/3256805148060887.html (v3, translucent colorway)