https://penfed.truecar.com/. What models are you interested in? The A6, A7 and A8 have $3k in Penfed incentives. All other models are between $1k - $1.5k.
EDIT: There is a thread on the forum PenFed Benefits - Up to $2000 AUDI MB FCA JEEP (usually $500 towards leases).