I have no clue what is available local so I will link you to a google search page.  You might want to stay away from the smallest ones unless your new wifi appliance is close to this computer.  The range on the smaller dongles is shorter than the larger ones especially if the usb port is on the back of the computer.

https://www.google.com/search?q=wifi+usb+dongle&oq=wifi+usb&aqs=chrome.1.69i57j0l5.8666j0j4&sourceid=chrome&ie=UTF-8