From what I've been hearing, they (Subaru) changed the policy for Ambassadors to give out coupons. Subaru wants the Ambassadors to a face-to-face giveaway of the coupons. That was my experience just recently when buying a new STI. Not sure how true this info is, but it's what I was told a few times by different people.
So. if you can find a local Ambassador (try Facebook or local car shows), you should be good to go.