Jerry,
I bought mine from Speed Engineering a go fast parts place out of California. They drop ship from Magnacharger in another town in California. It took about 3 weeks to get it, but it was the best price I could possible get without working for a shop that could sell them. A trip to LS1tech.com will give you lots of vendors and a few phone calls will to them will give you some figures to bargain one vendor against another.
As a note, using my local dealer for install would have allowed the third party drivetrain warranty via Magnacharger (a $200 option), but the dealer would not warranty it themselves- meaning the dealer would take care of any issues no matter what if I bought via the hummer parts dept. If I brought the supercharger in to them any warranty issues were between me and Magnacharger. Seems to me it shouldn't matter, as it sounds like your dealer is willing to stand behind their work. Mine wasn't unless I paid extra. I'm not impressed one bit with the dealerships here.
I would not buy one used no matter what, unless you know the person and knew the installation. Too much trust involved in that transaction as the most likely source would be a private seller via internet. I also doubt most people would bother to remove the higher flowing fuel pump (in tank pump on 2004 and 2005's) so you would have to get that separately. I know I wouldn't drop my tank again unless I had to!
Cory
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1985 Corvette with 427 BBC and Jerico (in progress)
2004 GTO A4 stock 275.8 SAE RWHP / 287.1 SAE RWTQ
2004 H2 w/ Full Custom Radix pushing 6.5 psi and Magnaflow 1/4 mile: 15.058 @ 87.52 w/ 2.19 60 ft
2002 Firehawk #966 (Traded in)
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