In talking with the sales guy some more he said that Tweeter corporate management is considering a no haggle policy chain wide in the near future. That is not the end all of deals but it will make it more difficult. The sales guy I was dealing with was able to change the prices on the fly with no manager approval.
I would hope that if Tweeter "adopts" this sort of policy, they make a price cut off their retail prices on all their gear. I think if they invoke such a plan, they could easily lose sales.

Fortunately, the DC-metro area has other audio shops that are pretty good to work with.

I recall a visit to Tweeter about a year and a half back. I wanted to get the Denon AVR-3803 receiver. The salesperson would not budge on the price, but did mention that the 0%/no-payments Tweeter card would save me some money. Needless to say, I decided not to go with the 3803 ... especially @ MSRP.