Spirit Halloween cuts up to 89% off a selection of men's, women's, and kids' Halloween costumes, with prices starting at $3.97. Plus, you can still get your costume by October 31 if you spend $30 or more and apply coupon code "WEBS" to bag 2-day shipping for $9.99. (2-day shipping usually costs around $28 or more.) Note that size availability may be limited. A couple of best bets: If you don't need the 2-day shipping, coupon code "EVIL14" cuts an extra $10 off orders of $50 or more.