simple google search shows some:
https://www.amazon.com/mini-pcie-wifi-card/s?k=mini+pcie+wifi+card
or are you searching for USB adapter?
they need to be compatible with linux/TOS / OpenWRT.
compatibility lists:
https://wiki.turris.cz/doc/en/public/usb-wifi-dongles
https://wiki.turris.cz/doc/en/public/wifi-cards