Bluetooth Number Pad, Alcey Wireless 22 Keys Multi-Function Numeric Keypad Keyboard Extensions for Laptop/Desktop/PCs/Notebook, Cool Gray https://www.amazon.com/dp/B07QTHXQKK/ref=cm_sw_r_cp_tai_BcxvFbQ5FDM2C

Keep an eye on the price. Looks like it went up

Edit : for anyone with a cheap diy pc without Bluetooth. Thus works great too

Bluetooth Adapter for PC，Techkey USB Mini Bluetooth 5.0 EDR Dongle for Computer Desktop Wireless Transfer for Laptop Bluetooth Headphones Headset Speakers Keyboard Mouse Printer Windows 10/8.1/8/7 https://www.amazon.com/dp/B085LB5Y8M/ref=cm_sw_r_cp_tai_AdxvFb5N4P5VT