found a semi-rigid case in Woolworths which turned out to be a fairly good fit for only £5 - here's a draft web page with pictures. I wish it were black!

http://www.zaurus.org.uk/images/nds_v_pdair/nds_v_pdair.html

I've not uploaded the max res images as I am on dialup (I'm on vacation at the seaside and logged on just to get a quick fix - sad aren't I!)

I think Grog and Holovector have that one too. They seem to like them.

I'd looked at various PSP and DS cases before, PSP cases are not the right size, and previously didn't want to waste money on an uncertainty, this was quite a bargain!