Im looking for something small and heat protectant, what are you all using? I see in the back of the manual for accessories they list a Camera Case O-CC28, but when I googled it, I only see it for sale online in Europe.
Small is easy. Depending upon the lens, my *ist D (along with battery grip and wrist grip) readily fits within a Pentax 85100 holster case. I paid $10 for the case new. It should be readily available from the usual sources.
Second part - heat protectant. This case is black. I live in Texas. It gets hot (i.e. warmer than body temperature) here in our long summer. To protect against excess heat, I'd suggest a larger case with an insulated freezer pack included as part of the contents.