I'm not sure where you can buy the tool near you , but if you are ever in Australia!
I know where i can get it near me, but that doesn't really help you
I have a small rivnut tool made by Wurth in Germany that looks like a hand riveter that does about 3mm to 6mm and a much larger one made by Trax(kawasaki) that does up to about 10mm in steel
but after a quick look at aircraftspruce
you can get a kit in the http://www.aircraftspruce.com/catalog/topages/nutserttools.php
The hex ones you can get from http://www.cardinalcomponents.com/hexnut.htm