1
) See our Hardware Compatibility List and look under the category 'Wireless Network Cards':
https://www.hpcfactor.com/hcl/
2
) No, it's only available through private sellers either on eBay or elsewhere.
(The local Fry's Electronics had exactly one boxed version of it for years after H/PCs went out of production, with no one buying, but that chain has unfortunately just gone out of business.
)