I counted 540. They sell a maximum of 550.
From their website:
"The 2009 power boat lottery has been completed. Everyone who applied for the lottery was successful. As of February 26th a very limited number of permits were left. Starting at 9:00am, Friday, February 27th, at the Standley Lake Nature Center, those permits will be sold to residents and non-residents on a first-come, first-served basis until sold."
It might be too late already. http://www.ci.westminster.co.us/194.htm