Champion Jeep/Dodge in Barrington, IL (Don Conrad) will sell you any 2009 Challenger for 1/2 the difference between Invoice and MSRP. I got $1,350 off my 2009 SRT order. They will deliver it to your door for about $500-600 or have it drop-shipped to your local dealer for around $300.

I live in New Jersey but bought out-of-state to get the best deal from one of the largest SRT dealers in the country (sold 150 SRTs last year).