well with the extended versions apparently the movies are like 4 hours long instead of 3. i'd get the extended version of return of the king if that meant the battle scene was longer.
Target(in stores only) has Lord of the Ring: Return of the King DVD for $15. There's a coupon for $5 off 10pk AA duracell batteries (makes it free for most people) and a 6pk box of ACT 2 popcorn for free.