You can order online from Amazon.com. It's available on various home sites such as Target and Home depot, but wasn't available at any our local retailers. Mine came from a flea-market (of course) covered in accumulated layers of grime, stained blue paint and nasty rust. A week and a little magic later, and the below photo shows the result. The corrosion came off with steel wool and the chrome below reappeared like new. The paint job was a bit more difficult, trying to find the proper shade of vermillion red, I finally settled with Testors Bright Red modelor's spray paint.
Junior now has no trouble at all climbing up it's steps to reach the forbidden cookie jar!