Buffalo WHR-HP-G54 IEEE 802.3/3u, IEEE 802.11b/g Wireless-G High Power Router and Access Point - Wir for $59.99
Newegg has the Buffalo WHR-HP-G54 802.11b/g Wireless G High Power Router & Access Point for a low $59.99 Free Shipping. Tax in CA, NJ, PR, TN.
Although this is an old router, it is still considered one of the best in terms of expandability (it is so expandable, Buffalo was actually sued for its line of routers HERE). It is Tomato and DD-WRT compatible, including DD-WRT MEGA. It also has a built-in signal amplifier for better range than a standard G router.