Finally got the cheapest USB 3.0 Express Card for my T420 😁 : r/thinkpad
Amazon.com: StarTech.com 2 Port Flush Mount ExpressCard 54mm SuperSpeed USB 3.0 Card Adapter with UASP - Dual Port Laptop ExpressCard USB 3 Controller (ECUSB3S254F) : Everything Else
ThinkPad X220: ExpressCard 3x USB 3 - YouTube
New Genuine Reader Card Bracket For Lenovo Thinkpad X220 X230 Expresscard Slot 04w6738 - Pc Hardware Cables & Adapters - AliExpress