I finally got a little nervous about my four-year-old grandson whipping my ukes around when he does his "ROCK 'N' ROLL!!!!!" routine, so I went out and bought him a little after-Christmas present.
His new $20 Toy Story 3 "Woody" uke has an all-plastic body, geared tuners with screw-locks(!), and a set of Martin strings that I took off one of my ukes. I've gotta say, I've been playing it all day and the thing is pretty darned cool. Its tone is about as good as many of the $50-75 ukes out there and it has held its tuning amazingly well.
If you have a little one that you'd like to get started on the uke but you don't want to spend a bundle, I'd check these out at Toys R Us, although someone mentioned that they were available at WalMart for half the price a few weeks back. They come in Toy Story 3, Cinderella, and a few other Disney character models.
Now excuse me...I'm going back to play it some more!