I also had to ask where to get it...at a reasonable price anyway. Just go to the nearest place you'd take your car that's an official GM Dealer, ask their parts section. Only about 7 bucks.
I was wondering about the isopropyl too. I also wonder if you can put GM TEC in the fuel in order to give the injectors a good blast...but I ain't gonna try it unless I'm reassured it's fine. Not sure what those chemicals would do to the pressure regulator and such.
