Over the past few months, JavoEdge has been furiously releasing cases for all sorts of PDAs. Just today, they announced new cases in their leather case line. New cases compatible with the O2 XDA III, O2 XDA IIs, MDA III and others are now available. They come with 4 sturdy brakets to hold the device in place. A metal rimmed camera cutout lets you take pictures without having to take the device out of the case. The price for these cases is $34.95 USD.
JavoEdge also has a line of clear cases for a variety of PDAs including the iPAQ h3600, 3700, 3800, 3900, 5400, 5500, 6300 series and some iPods. These cost $23.95 USD.
Check out their site for more information on all these cases as well as other accessories.