Building a working R2 of your own will cost about $500 to $2,000 and at least a couple months worth of labor on the weekends. Fortunately, there's a much easier alternative to getting your own astromech. Habro sells the R2-D2 Interactive Astromech Droid, a 10.5-inch version of R2 that is has voice-recognition, location sensors, and a navigational system powered by sonar technology.
Watch as Jason Hiner, TechRepublic Executive Editor, reviewed Hasbro's R2-D2 Interactive Astromech Droid as part of our Geek Gifts 2007 series. You can read the full review in his blog post, "Geek Gifts 2007: R2-D2 Interactive Astromech Droid by Hasbro".