OK, well I am not familiar with how Lexus works, but they have a massive markup between invoice and MSRP.
For example a well-equipped IS 250 AWD has an MSRP of $39,630 and an invoice of $34,690, thats a whopping $5000!!!!!
Compare that to a BMW 325xi MSRP $40,145, invoice $36,825 difference = $3,320. That is $1,690 difference between the markups on those cars, and you don't think Lexus has more room to come down?
Even better if we look at Audi A4 2.0T Q with an MSRP of $39,635 and an invoice of $36,747 a paltry difference of $2,888, that is $2,112 difference between the markup on the Audi and the Lexus.
I am more familiar with German cars and in a standard situation (not an M3, not within the first 3 months of production) where each dealer has 25+ cars sitting on the lot and there are 6 dealers within 35 miles they are more than happy to make a clean $1000 (+ any secret dealer cash they are making).
I'm not sure why so many of you are opposed to the idea that you can bargain on your cars to get a better deal. yes if you bought your IS car within the first 90 days of production you probably paid a premium, but if you are telling me that the $5000 markup on these cars is not negotiable than I don't understand. They guy who offered me $2000 off anything he had in the lot or incoming knew he would still make $3000 profit, that is more than an A4 at sticker.
Negotiate all you want and get the best deal you can. I'm just saying that you can't always go by the "deals" some buyers claim they got, because they don't give the total picture. Maybe you can get as new IS for $1000 above invoice come September if there are any out there that are equipped the way you want. Other than that, I wouldn't attempt to tell you anything.