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Q:  Where can I get low-cost 802.11N (G/B compatible) PCI, PCMCIA and USB compatible adapters w/OS X drivers?

A:  OWC originally sold the (RAlink chip based) Edimax 802.11n PCI, PCMCIA and USB 2.0 adapters on the Xlr8yourmac Site Specials page for $59 each but in Early Feb. 2008 the replaced them with their own line of NewerTech branded models:

" Have replaced the Edimax 802.11n products with our NewerTech product line and now with prices for XLR8YourMac readers (as of spring 2008 all are under $50). Our NewerTech line comes with the Mac driver + a real Mac manual right in the box and full Mac support from NewerTech of course... And no one getting better pricing than your readers on this line.
The NewerTech USB 802.11n/g/b adapter is also rather unique in that it includes an extension cradle so you can better position for reception if so desired. It works straight to the USB port too, but the extender cradle is a nice bonus for those that need that extra positioning. (The PCI card model includes a triple antenna pod that can also be relocated.)

Also on the list too is our 802.11n/g/b performance router too. At $65 it's one of the most cost competitive 802.11n routers on the market while also being among the most feature laden too.
Best Regards,
Lawrence R. O'Connor
Other World Computing"

Here are links to the site specials page PCI 802.11N adapter, PCMCIA card 802.11N adapter and USB 2.0 802.11N adapter.

For notes on 802.11n adapter/upgrades for Intel-based Macs (that didn't originally ship with 802.11n support) like the earlier MacBook/MacBook Pro, Mini, etc. - see notes on the Mac 802.11n page.