Newegg has the Rosewill RNX-N150HG (RNWD-11004) IEEE 802.11b/g/n, USB 2.0, High Gain Wireless-N Adapter (1T1R) Up to 150Mbps Data Rates, 64/128-bit WEP, complies with WPA/WPA2 standard (TKIP/AES) for $11 with free shipping. Includes a Rosewill RNWA-UC10 USB Cradle. 
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no direct windows 8 support, but will probably still be detected like my tp-link adapter is in windows 8 as an atheros.