oooh, I haven't seen them in years ...

the closest I've seen of late are either actual dance shoes (which you should be able to get from any ballet school, gymnastics group, dance academy, etc - or possibly from places which supply them online??) or the "party feet" line have some little shoes which are basically jiffies, designed to be folded up into your bag when you go out ... not sure what their smallest size would be though - they might only be in ladies' sizes ...?

good luck! I *loved* my jiffies, but now I just use split soles.