Star Wars fans get ready to look like your favorite character this Halloween by dressing up like Darth Vader. Amazon is offering this Darth Vader Adult Halloween Costume for only $18.79 plus free shipping on orders over $25 or for Amazon Prime Members. Sales tax where applicable. You save over 28% off the retail price. This is the best deal found on this Halloween costume. Comes in sizes M, L and XL. Expires soon.