Wifi-7 modems (some of them are AP-capable) are now available for around 15-30€. They support all bands (2, 5, 6)
Have a look at the Mediatek (MT7925E) and Intel (BE200-BE202) cards. There also the more pricy Qualcomm QCNCM865.
The Mediatek and Qualcomm also works with AMD mainboards. The Intel cards are not compatible with AMD mainboards as they are using a proprietary stuff.
At leas the Mediatek works fine with Linux (currently running in Thumbleweed) and AMD.
Just to add additional context, there are a whole loads of components from RF Filter to antenna itself, RAM, etc for an AP or Router. In case anyone got the wrong estimate of BOM cost. Ignoring any other R&D / NRE or Capex involved. And all that excludes the cost of software.
But by buying one of these m.2 cards this stuff is already done. Connect it to the PC and U.fl antenna and start playing around with them.
Maybe I should have clarified that these mentioned chips are already places onto M.2 cards you can buy from Ali/Amazon&Co.
Edit: Qualcomm= atheros, sorry