Extend the reach of your existing Wi-Fi network with the D-Link DAP-1320 N300 Wireless Range Extender. The D-Link range extender has the ability to perform at speeds of up to 300 Mbps, is easy to set up, and has a compact design that won’t block other outlets.
If you can't find anything to combine with other deals to reach $300 mark for AMEX credit, this will be something you can grab.
Read this comment before buying.
For anyone considering this whose a bit techy savvy, I'd recommend going with Ethernet over Powerline instead. You'll get a much better ping suited to online games. You can even put an access point on the other end if you need Wi-fi and turn DHCP off so everyone is on the same network as the main router.