The Trunki appeared here as an airport entertainment hack a couple years ago (see: Trunki suitcase keeps toddlers entertained during flight delays). Adorable hard-sided suitcase designed to be ridden around, which kids do with regular wheeled luggage anyway.
Amazon has put a selection of Trunkis on sale at 40% off the regular price ($23.99; eligible for Amazon Prime and Super Saver shipping). Great way to keep little ones busy during travel wait time and get them accustomed to eventually handling their own luggage.
At Amazon: 40% off Melissa & Doug Trunki
Price good through 5/21/11.