I guess it depends on the dealer, I've NEVER more than 80% of MSRP on any speaker. If the dealer doesn't budge, I go to another dealer. Even electronics I always get a discount at my local audio store. At least 15% on DVD players, 15% on receivers etc.
Paradigm is a bit more stingy than others. And my local B&W has the trade up policy so he's full MSRP. So your mileage may varying depending on the dealer. I find the independent ones more likely to be willing to deal. For example, I went to shop for a Mirage speaker at a Good Guys store in Las Vegas and the Great Indoors home store....their policy is full price unless on sale. But my local independent dealers here regularly will knock 20-25% off the price.
Also, I do wait until after winter clearances, sometimes there are good deals to be had.