[quote name='Kirin Lemon']If you have the TV series already, don't waste your money - the movies are just a compressed version of the TV show. And if you don't have the TV series, well... just consider buying it instead of the movies anyways. They're just not good.[/QUOTE]
I'm usually not one to bag on people's choices when they're looking for a deal, but I gotta agree with KL here. If you've never seen the series before, and want to sample it through the movies, you're really doing yourself a disservice. At Otakon a year or 2 back, I went with a friend to see the first movie; I had already seen the TV series, but he hadn't. About 10 minutes in, I got a phone call and happily excused myself; I wound up skipping the rest of the movie. When I met up with him later, he said he enjoyed it - what little he could actually comprehend, that is. He wound up borrowing the TV series from me and enjoying it far more.
Bottom line: Unless you're a diehard Gundam nut who absolutely needs the Seed movies for the brief snippets of new animation interspersed throughout, don't bother. Watching the movies is like watching the TV series on fast-forward (32x minimum). They're a waste of time; unlike the 0079 and new Zeta movies, they don't actually change/add anything to the Seed story IIRC. Do yourself a favor and buy/rent/borrow the first volume of the TV series and see whether or not you like it.
On the other hand, if you know full well what're you're getting into, I'll just echo other people: wait for the next DeepDiscount 20% off sale, or wait for TRSI to have a Bandai sale or have the movie(s) as a Weekly Special.