I'm pretty sure Symbol makes Palm attachments or special Palms with wireless networking capabilities... try checking them out
[Edit]
http://www.symbol.com/products/wireless/flash_card.html
It's apparently a 802.11b card that works in your CompactFlash port. It's designed for PocketPC's, but on Symbol's
wireless section you might be able to find something for Palms
[/Edit]
[Edit 2]
A quick glance at
Palm's accessory page reveals that they sell both modems and Bluetooth connectivity devices. For
400 to
500 bucks, you can grab yourself a Bluetooth access point. Didn't see anything about 802.11b, but you could try Googling it and see if you come up with anything (if I found these things by just clicking a few links on sites, Google should come up with plenty of hits for what you want).
[/Edit 2]