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The Satechi Wireless Mini Dual Band Wi-Fi USB Mini Adapter [amazon.com] is everything you need in a Wi-Fi adapter.
Price:$ 9.99

Features

• The Satechi adapter complies with 802.11 a/b/g/n/ac and may be used with Windows XP/Vista/7/8/8.1.
• An exceptional device for the price, this pocket sized Wi-Fi adapter supports speeds up to 433Mbps, so even your older computer can enjoy the full potential of your wireless network.
• Plus its user friendly set up and compact size makes it ideal for traveling and using on the go!

This device [amazon.com] is similar in compatibility and speed; listed at $ 17.79

This device [amazon.com] supports speeds up to 300 Mpbs and is listed at $ 12.99