Check Daddiesboardshop.com a few days a week through November.
Last year they had the best prices for NS boards on the internet, and are a great shop...and luckily for me local here in Oregon.
But as you said, the boards do tend to sell out quickly so you need to be careful. They will be even more popular this year than last so i expect another bunch of late season posts for people trying to find NS boards that are all sold out...
'09 151 Never Summer SL-R
'10 K2 T1 DB Bots
'09 Burton Cartel Bindings