coupon code: GET5
CostumeCraze.com is offering the Aqua Teen Hunger Force Adult Meatwad Costume for $5.60. Coupon code GET5 lowers the price to $5.32, plus $3.99 for shipping = $9.31 shipped. It does not have the ability to shape-shift into an igloo or hot dog.
Amazon sells it for $11.59 shipped, which is the same as mentioned by wootbot for buy.com.