I just ordered this from AliExpress and it worked great with my Pi and is cheap. I was reading about wifi options on the form and took a chance ordering it and it works.
As soon as I plugged in the USB adapter Wireless LAN setting option showed up under "network" options.
Working fine so far using the stander 5w USB wall plug for power, I wasn't sure if I needed to use a powered usb hub in order to run the adapter but looks like I'm good.
Good luck
http://www.aliexpress.com/snapshot/6149991611.html
Product Description
EDUP EP-N8508GS:
802.11b/g/n 150Mbps Wireless Multi-Function AP/Client USB Adapter
Model: EP-N8508GS
EDUP"s Wireless-N USB 2.0 Adapter allows you to connect your laptop or desktop to any Wireless-N networks in your home or office. The Wireless-N (802.11n) USB 2.0 Adapter is great for those who want to upgrade older computers to be able to access the internet over a Wireless-N network.
At 3 times faster than traditional Wireless-G (802.11g) networks, Wireless-N networks allow for high speed data transfers, online gaming, and lightning fast downloads. The Wireless-N USB 2.0 Adapter gives you access to all the high-speed features of Wireless-N networks on older and newer computers. Its simple and easy setup means you"ll be surfing the internet, downloading movies, and e-mail in no time.
Features:
• Multi-Function
a. Client mode: Easily plug to your PC/notebook and receive wifi signal up to 150mbps.
b. Soft AP mode: Plug it to your PC/notebook connected to internet and Share the internet to multiple devices.
• Ultra mini size with high performance with GOLDEN USB plug
• Retail packaging - other than OEM products in ebay
• 3 times faster than 802.11g
• Compatible to over 99% devices
Package Content
• Brand new EP-N8508GS adapter x 1
• Driver Disc x 1
Rasp Wifi - USB Adapter EDUP
Moderator: Mattk