I'll add 8814AU USB (USB3 or external powering might be needed) based wifi dongle with AP support here. Its performance is ofc worse than mPCI based Compex, but still, it performs reasonably well. You can't attach external antennas to this particular model (except if you DIY), but it cost only 23USD shipped. http://s.click.aliexpress.com/e/EyrJ6ai (I got mine even for a few USD less than this).
I haven't made a proper multiuser test, so I actually don't know how it performs with lots of clients. With a few, for SOHO usage, it works good enough.