Newegg is a great place for bargains. I upgraded my wireless for notebook for less than $50 delivered using deals here. They ship quite fast, usually for FREE. My wireless LAN is now about 12X faster and 4X the range. I'm still able to keep my existing router by adding a FASTER wireless access point (AP) to it: TrendNet TEW-637AP and a Wireless N card to the PC from Belkin.
Two pieces of hardware & very easy to set-up.