Regardless of whether what they're saying is true or not, if they want to make the sale they'll give you that cash off. They tried to tell me that I couldn't qualify for the $500 dealer rebate + $500 college student discount + special financing rate, but after some negotiating (and a few threats to just walk out and go to another dealership) they gave me all three and didn't charge for dealer-added accessories (VIN etching, 3M Clear-Bra film, keypad unlock, etc).
If you get them close to a sale and don't like the price you're hearing, just tell them you'll take your business elsewhere. Trust me- they'll do anything within reason to sell you a car
2011 Fiesta SE Hatchback (Rapid Spec 203A, Injen CAI, Flowmaster dBX Cat-Back), bought 5/16/11