Amazon with Beauty Kiosk has the Actiontec WCB3000N Wireless Network Extender for $13 with free shipping on $25+ or with Prime. Supports 2.4Ghz and 5Ghz bandwidth.
Newegg has the ASUS RP-N54 Dual-Band (2.4 GHz, 5 GHz) Wireless N600 Repeater / Access Point / Media Bridge with RJ45 10/100 Ethernet and Audio Ports for $49.99 - $25 off with coupon code EMC
eBay with Linksys Official Store has the manufacturer refurbished Cisco Linksys AC3200 Smart Wi-Fi 802.11b/g/n/ac Wireless Tri-Band AC Router with 4 Gigabit Ethernet ports and 2x USB (EA9200-RM2) for $65 with free shipping.
Backwards compatible with 802.11b/g/n, draft 802.11ac promises speeds 3x faster than N.
eBay with bigdeals has the new, open box D-Link DAP-1320 Wireless N300 Compact Wi-Fi Range Extender for $9.99 with free shipping. Features 300Mbps wireless performance, works with any Wi-Fi... More Details