eCost.com has the SMC EZConnect 802.11b wireless PC card with configurable transmit power (up to 100 milliwatts meaning greater distances) for $19. Only 58 left with the deal set to expire in about 68 hours.
They’ve also got an Adaptec 802.11b Wireless 4-Port Router for $39.99 (4 left with 70 hours to go) and the Adaptec 802.11b Wireless Access Point for $29.00 (no idea how many or how long the deal will last).