The 2-movie collection of Tron and Tron Legacy
It's a jam packed set. Well it is if you have any interest in the 3-D Blu-ray (which I don't) or the Digital Copy (which I don't) or the DVD (Which I don't.) But some do and if that's you then this is probably your best value.
As far as the films go, Tron
Both films do look incredible. Tron Legacy especially. The original looks extremely well despite its age. The sound of course is stellar as well.
Disney has done a great job with special features again, aside from the plethora of discs in the set, you get a lot of interesting featurettes (including the Flynn Lives short that's all over the web now.), a music video, a peak at the upcoming animated series and much much more.
Buying the films individually will cost you $22.99 each. For about $50 you can get this 5-disc set. It's the better value. Especially if you plan to go 3-D in the future, although I can't imagine why anyone would.
Tron and Tron Legacy 2-Movie Collection
RAWR(for more)