From MINIUSA PR:

MINI USA reported strong September sales, marking the first month the MINI convertible went on sale in the U.S. September sales of MINI automobiles were 2,917, up 27 percent from the 2,295 sold in the same month of 2003. Year-to-date, sales of MINI automobiles were level, with 25,670 cars compared to 25,720 sold a year ago.

With '05 deliveries in full force it would seem the sales numbers are back on track compared with the previous months.