It was $41.37 total shipped from newgmparts.com. The pigtail was $19 of that,plus $7 S&H. You might want to call around your local dealerships and see if they can get it cheaper. Even with the price, for the gain I think it was a great deal. Especially compared to some of the tuner brandname pieces which are twice the price.
I'm still playing with it. Boost gain down to 53 and still detuning the map. Had it fluctuate up and down from 18 to 15 and back once, but it seems to be working better now.