All the Jolla cases on eBay seem to be pouches/bags but I wanted a flip case so I can answer calls faster (by the time I've fished the phone out of my pocket, the caller has already waited some time).

I bought a Terrapin flip case for an Xperia SP: http://www.ebayitem.com/190952514697 I'm very pleased with it (though I'd prefer a Jolla specific flip-case that had holes in correct place for camera +flash).