Since the official TRON: Legacy toys are a little too expensive I bought this activity book (RRP about $5-6 AUD) that allows you to make 3D cardboard models of the Recognizer, Sam's Lightcycle, C.L.U's Lightcycle and Quorra's Lightrunner. Considering that the models were from TRON certainly made up for the fact that constructing them was very tedious indeed!
Each model measures at approximately 15cm (6in) in length (+ height for the Recognizer) and took about 30mins to an hour to build. If you like making things with your hands and have some time to kill I would recommend this book. You will need patience (sometimes quite a bit!) and some sticky tape to hold the joins together.
Apologies for the quality of the images, they were taken with my iPod:
Disney Enterprises 2010, TRON: legacy construct and play, Parragon, UK