Halloween is a mere three and a half weeks away, and if you haven't ordered your costume yet forget waiting until the last minute. Get ready for the holiday, and save a bundle with one of three coupon codes from BuyCostumes.com . For smaller orders, take $5 off orders over $25 with coupon code poison5. Have more than one costume to buy? Not a problem as you can save $10 on purchases over $50 with coupon code poison10. And finally, for orders over $100, take an incredible $25 off with coupon code poison25. Coupons expire 10/09/2011.