External (USB) Wireless Adapters

TP-Link Wireless N 300 USB Dongle $35
TP-Link Wireless N 600 USB Dongle $50

Internal Wireless Adapter Cards

TP-Link Wireless N150 PCI Card $30
TP-Link Wireless N300 PCI Card $40
TP-Link Wireless N300 PCIEX Card $40
TP-Link Wireless N600 PCIEX Card $50

Wireless Routers and Extenders

tPLINK Wireless Range Extender $65
Netgear Wireless N ROUTER 4 port $55
TP-Link 3G Wireless N Router $69