OfficeDepot.com has the D-Link AirPlus DWL-650+ Wireless PCMCIA Adapter at $49.63. Add item 429266 to use the $15 off $50 coupon. Final cost is $50 - $10 rebate (Exp. 7/26) - $10 rebate - $15 off coupon (code 35179279) = $15. Free shipping.
Click the coupon, search for item# 613630 or use "Order by Item #" to order it.