Perhaps I am the last mom to figure this out, but I have always wondered why they make Robeez in sizes beyond "walking age" and then it dawned on me that they would make great slippers/indoor shoes in the winter. S has been running around barefoot at home until now.
Robeez.com has their holiday slip-ons marked down to $12.99 with free shipping. While they aren't my favorite appliques, they will do for house shoes.
Also, when you order a pair of slip-ons, Robeez donates a pair to a child in need which makes the $12.99 well worth it.
Finally, make sure you order via Ebates, Shop at Home, or another to get 7% cash back. If you are unfamiliar with these, you can read Money Saving Mom's post about "Stretching Your Dollars Online".