Well, LCSC [0] has microB at around $0.02 [1] and USB-C (16 pin) at $0.05 [2]

[0] https://lcsc.com/products/USB-Connectors_369.html [1] https://lcsc.com/product-detail/USB-Connectors_XKB-Connectiv... [2] https://lcsc.com/product-detail/USB-Connectors_G-Switch-GT-U...