Priced at $10 a pair (about €7) and available in gold, black, silver, or purple (because we need disposable shoes to match our outfits), the roll-up flat shoes are installed in 4 clubs south of Munich so far. They even come with a bag to put your heels in. There are other similar sellers in the UK.
Check out the site here.
Here's a thought - DON'T WEAR HIGH HEELS OUT DANCING. Jeez, do I have to think of everything?