Oooooh—Amazon has marked Scribblenauts for the Nintendo DS down to just $9.55! Free Prime shipping, or free Super Saver Shipping on $25+.
This (and Super Scribblenauts, which is still nearly $30) is one of my kids’ favorites. And unlike many of the DS games, which seem to me an exercise in pushing a button or drawing lines, this one actually makes them think and get creative. (Also: It’s rated E10+, but if your kid’s a good reader, I’d say it’s good for maybe 8+.)
In short, it’s a great price on fun educational game. Get it, if you haven’t already.