If you still need to buy a Halloween costume or need other Halloween Gear Amazon has launched their Halloween deals.
If you spend $50 on qualifying Halloween costume items with one of the sellers indicated on the site you will get $10 off the total cost of your order at checkout. More details on this Amazon page.

If you still need a cool costume for Halloween check out our 2009 Halloween Costume Choices For Geeks.
Amazon has also a deal on Halloween candy. Get $15 off when you spend $39 or more on Hershey's, Mars, Nestle, or Wonka chocolate and candy products shipped and sold by Amazon.com. Offer valid through Oct. 31, 2009.

Lastly you can also find deals in the DVD Halloween Sale on Amazon, which has DVDs as Low as $5.49 & Blu-ray up to 50% Off. And for the horror fans, there is a buy one, get one free Horror DVD Sale. Offer valid through Oct. 31, 2009.