Don't just get a supercharger for it. Get a complete engine. There's more to it than that.
www.zzperformance.com has a wiring kit to adapt your harness to the L67 (S/C 3800) PCM, so you can control the supercharger. Besides, I don't think the dealer would sell you one anyways. You can do what I did, and just get a complete engine and transmission with axles. That's the best way to do it, so you don't forget any parts.
www.l67swap.com is a good site to reference.