If you're tempted by the events, activities and camaraderie of Audi Club North America (ACNA), here's a $500 clincher. All ACNA members who buy or lease a new or certified pre-owned Audi from April 1 through December 31, 2008, will qualify for a $500 cash rebate check from the ACNA. You need to be a member for at least 90 days before you buy or lease in order to claim your rebate. All claims must be sent in before January 31, 2009.