Want a digital copy of How to Train Your Dragon for two bucks? Walmart’s VUDU service which lets you get a digital copy of your already purchased DVDs and Blu-ray Discs has added Dreamworks titles to the mix. The Dreamworks library includes hit movies like Megamind, Shrek, Madagascar, and Kung Fu Panda. If you haven’t tried the Walmart service yet, it’s pretty easy. You just walk into a Walmart Photo Center with your disc and an associate will help you set up a VUDU account if you don’t already have one. Through VUDU, Walmart will authorize a copy of your disc to be accessible from your account. DVDs and Blu-ray Discs cost just $2. Or, upgrade your standard-definition DVD to HD for $5. Studios who are already in on the Walmart service include Paramount, Sony Pictures, Twentieth Century Fox, Universal Studios and Warner Bros.