Two Wireless cards can converse adequately. Most cards? software let you choose between Infra Structure, and Ad-Hoc Mode.
Infrastructure = Card to Access Point.
Ad-Hoc = Card to Card.
In case of Internet sharing with a Router, Ad-hoc (card to card) will drop the receiving card out of the Sharing loop, and additional Nat software will be required.[/]
Price wise you can get "El Cheappos" PCMCIA cards offered for $50 or less.
However, to put a Wireless Client Card into the Desktop, you need either a PCMCIA card with PCI Adaptor ($40), or a USB client Card. Either of these cards has to of good quality to maintain a reliable connection.
I today?s market prices, most of this type of ?creative solution end up saving $20-$30, and usually result with a un efficient system.