Check out
www.centerlinewheels.com and look at the RPM's they weigh in at 13.5# for the 17"X7" Forged one piece. Best price I have gotten so far is at Discount Tire for 275 each but they have to order them and it will take 2-3 weeks. Sears also sells them, but again you have to order them. Both places you need to go in to the store, they are not on their websites.
CENTERLINE RPM's
Racing Hart Evolution S7 EVO 18 X 7.5 weigh in at 22.2# each