All the new Halloween lines for this year just debuted in the last couple of weeks/CHA. I think most companies don't start shipping until next month so you may have a better selection if you were to wait until August to do your shopping.
Here is a link to most of the new collections:
Vote for your favorite Halloween Collections of 2012!
Good luck!
PS - My favorite online store is iheartpapers.com Great selection and awesome CS! They just had a HUGE patterned paper blowout so their selection is next to nothing right now, but it was to make room for all the new stuff from CHA!