I got one
I got one of those Sinjimoru pouches that HKSpeed mentioned. It's very useful, I now barely ever take my purse with me.
However, I noticed that the edges on the seams aren't that great, it started to lift off after a little while, but maybe because I've stuffed like 4 cards in there. I've "fixed" it for the time being with super glue. And don't get the white, it gets dirty easily and can't wash it off :P