It's only been used twice, and is in perfect condition, in original packaging. All seals properly lubed and stored nicely. I'm asking $400, including freshwater and saltwater filters. I bought it from BlueWater photo for the RX100 MkI/MkII , Recesea model # WHS-RX100. I really liked the Recsea model because all the funtionality of the camera was easily accessible. (Both the original MK1 and MKII fit perfectly and I'm almost 100% certain that the MKIII and IV will also fit and function the same, but I don't have one to try). Anyway, I especially liked how easy it was to get a proper custom white balance very quickly, as well as zooming/shutter speed/ISO/Aperture all easily accessed . As a 35 year veteran Video Director and Photographer I've seen a lot of cameras come and go, but I'm a huge fan of the RX100, it's one of the best cameras on the market anywhere near that price range.
I'm selling it because I lost the camera recently (I've been mounting it on a Phantom quadcopter for some amazing shots, and had a fly away 2 months ago, and still can't find it... a very expensive mishap!). Plus, I just didn't use it much... living in upstate NY my diving and UW shooting opportunities are limited, at best.
PM me if interested, thanks