BuyCostumes has the Black Shadow Stormtrooper Adult Costume on sale for $3.99 - 20% off with coupon code FRIGHT20 + $7 shipping = $10 shipped. Free shipping with Shoprunner. Originally $60. Includes full jumpsuit and Stormtrooper helmet.
Shock Rock Zombie Adult Costume for $8.51 shipped Green Lantern Deluxe Kilowog Adult Costume for $8.99 shipped Batman The Dark Knight Rises Bane Adult Costume for $8.99 shipped