If you want just one trilogy or the other (I'm sure the prequel trilogy is all most of you want), you can get them separately, or go all-in on one monster box set. The whole shebang is listed at $140, but you can preorder it from Amazon now for a much more reasonable $90 if interested. Just know that they're gonna try to sell you these things in 3D in a few years, and after that maybe a hologram version of it. George needs to eat, after all.
Star Wars Saga Coming to Blu-ray This September
Star Wars on Blu-ray is coming soon.