[Esteban]

BMW calls these wheels "extremely light weight." Don't know if they're all that, and don't really know what a light weight wheel weighs, but Turner Motorsport quotes shipping weight as 25 lbs. I won't be racing anyway so it's not like every ounce counts. Turner Motorsport sells them for: front $431.95 and rear $473.95 each.

Definitely not cheap -- but it is genuine BMW -- if that matters to you, because it does to me. Everything on my car is genuine BMW. I don't mind paying for the real thing and I don't feel like I'm wasting my money. I've had my 313s on since early 2011 and have had zero problems.

Edit: Found them for less here. ECS Tuning - front $376.89 and rear $414.05 each.