a company I have dealt with in the past is
Buy, Sell & Trade Used Luxury Watches Online - Pre-owned Panerai, Rolex, Breitling for Sale
they are all used watches - usually in excellent shape and you can work with them on price. If they do not have what you want at the time you can tell them what you are looking for and they usually come up with one pretty quickly.
WatchUSeek is a good site as well (mentioned above) - It is the pelican forum of watches and has a large and active forsale forum. Watches deemed not kosher are weeded out very quickly
Oh here is a link for the watch I believe you are looking at - at watchuwant
http://www.watchuwant.com/watches/breitling-chronospace-blacksteel-limited-edition-chronograph-ref-m7836522/ba26-special#.VHncwWd0y00