Easy. Ebay for cheap. Pick up an oder PCMCIA wireless adapter and Nic Adapter (if it doesn't have one) for under $10 bucks. Heck, go to a mom/pop PC store I bet they have one in back old enough to have Win98 drivers.
You should also be able to upgrade to max memory via ebay or local store for cheap. Crucial.com will tell you what you need.