United Auto Group Inc., the auto retailer charged with distributing the Smart fortwo when it arrives on U.S. shores in 2008, is reporting that 12,600 people have plunked down $99 to become a Smart "Insider" and reserve a spot in line to buy DaimlerChrysler's microcar. That number of people represents about three-fourths of the 16,000 fortwos that will be sold in the car's first year on sale in the U.S., and there's enough time before then that the entire allotment could be, in a sense, "sold out" before it actually goes on sale.