Just like Todd wrote, try DPE's, jlines, or iForged. I'm actually on my fourth set of iForged wheels and picked each set up for roughly about $3.5K (not including tires obviously). DPE's will run closer to $4K.
For iForged, try e-mailing
Daniel@themodcity.com. He will hook you up with an incredible deal since they are the largest iForged dealer in the world (he can also get DPE's and other lines as well). Just tell him Patrick with the black BMW 545i and the Lexus IS350 sent ya.