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I've been given discounts from the guys representing AM... but you need 50 posts. Also asked not to share, but if you PM them after you have 50 posts I'm sure they'll be glad to send you something, as they did for me.
I know someone who got it before their 50th post, but is right around 300 posts now, so it wasn't a bad choice. He's also spent over $1000 on his Mustang in 6 months.
I've been successful with placing orders via the telephone, stating I'm a forum member, or being asked if I was, and receiving discounts. Just throwing it out there.