MSRP is pretty much the standard deal on an ACR, and you should have no issue finding that. Under MSRP - who knows - maybe if you are lucky, or maybe the down economy will make dealers more willing to negotiate. As far as I know, demand is still generally outstripping supply for the ACR, which means no discounting (but in a strong economy you can bet ACRs would be hit with an ADM, so consider it "discounted" at MSRP!).
As Raven states, I'd go with a dealer mentioned here on the VCA forums that supports the club. That way, you know they'll actually be able to get the car. Mom and Pop dealer might be willing to offer a crazy deal, but might not have allocation to ever get the car.
Good luck!