Here are the discounts on Halloween decor as of today, November 4:
Hobby Lobby - 66% off
Target - 50% off decor, 70% off candy
Shopko - 75% off
Walmart - 50% off
CVS - 50% off
Walgreens - 50% off
Michaels - 80% off
Pier 1 - 75% off
Keep in mind that discounts and inventory can vary from store to store.
I'm going to hold off until Wednesday or Thursday to see if I can snatch up bigger savings. Of course, I run the risk of items being picked over or gone. I ran to Michaels on November 1 and they had a decent selection left at 80% off. The cashier said they had three times as much on October 31 and that it was 80% off then. I'll have to remember that for next year.