Infiltrator, you should check this guy out
http://hackaday.com/2010/08/18/drone-crack...i-from-on-high/
I believe it uses a 3G modem for communication.
Pretty much everyone on the forums is using the Teensyduino plug in.
http://www.pjrc.com/teensy/teensyduino.html
It includes all the files you need to get it to work.
I'm assuming you're talking about a teensy.
Unfortunately, I don't think you could find one in any walk-in store. They are of course available on-line here.
If you know the router you want to try it on before hand I reckon you can modify the payload ahead of time.
But there are so many different kinds of routers out there there wouldn't be any real way to standardize it.