I've been looking for one for about a month or so now.
Panasonic don't list one on their accessory site either.
Would imagine I will end up with a Lowepro as their stuff isn't too bad at all.
Guess it all depends on the type of case you're looking for. This offers good protection, has an external pocket & is bit of a bargain at £11.75. Push your order value up to £19 & delivery is free with a 3-5 day service. Only downside is buying from that useless bunch of at Amazon where "in stock" + "3-5 day delivery" somehow seems to equal a fortnight.
I am not too bothered about an official case. You can get panasonic lumix branded cases on ebay and they look a bit ugly IMHO.
I was more interested in what other owners use and if I went for a lowepro or similar - which size best fits the fz20 (I don't have a local stockist so can't take my camera to try them out).