AliExpress 4×4 Matrix 16 Keys 8pin output Button Keypad – US $0.58
https://fr.aliexpress.com/item/Smart-Electronics-8pin-4×4-4-4-Matrix-16-Keys-Button-Keypad-Keyboard-Breadboard-Module-Mcu-for/32488741954.html?spm=a2g0w.10010108.1000016.1.7ccf476frh2dOF&isOrigTitle=true