Those prices are with tires. The wheels alone cost about $600 each from BMW or elsewhere.
It may seem expensive if you're used to looking at steel Ford wheels, but BMW's wheels are made by BBS. If you look at TireRack, most BBS wheels sell in that price range.
2008 135i Montego Blue sport pkg, premium pkg, Logic 7 sound, iDrive/Nav
Mods completed: JB4+ & FBO || LSD || BMW-P suspension + F/R sway bars || 18" Breyton GTS-R || M3 front bushings || Vogtland camber plates || BMW-P rotors + Stoptech pads |||| Acquired, not installed: BMS WW Meth kit || Logic HVI intake || Mishimoto OCC |||| Shopping for: Summer tires