Month-by-month sales figures for US and Canada can be found at this site:
Scion iQ Sales Figures - GOOD CAR BAD CAR
In August, there were 548 iQ's sold in USA, and 85 sold in Canada.
Reports of 2012
year-to-date sales figures are:
Scion iQ: 6189 USA / 663 Canada
Smart ForTwo: 6281 USA / 1482 Canada
Fiat 500: 28,566 USA / 6436 Canada (I suspect zero-percent financing rates and aggressive discounts have helped both Fiat and Smart in the USA--They almost had me hooked!)
Chevy Spark (AKA Daewoo Matiz): 4090 USA / 110 Canada (this is two month data; am surprised at this because I still haven't seen one on the road. Too bad haven't found state-by-state sales figures yet.)
Personally I am happier to have a more unique car than ubiquitous. And our iQ's build quality and innovation trump any of the above competitors.