I've had great luck with my Centrals using the Linksys Model USB100TX. I see on eBay that there are a few up for auction, with one of them listed at a Buy It Now price of $7.99.

Randy
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Happy owner of 2 Centrals, 2 Empegs Mk2a 160GB, 1 Empeg Mk2a 60 GB, a Rio Riot, 4 Rio Receivers, and two 1GB iPod Shuffles...