For a project I am currently working on (to be detailed shortly), I needed an oscillator capable of covering 8 to 12 GHz. There are quite a few of the miniature Stellex units on eBay, but they generally don't go much past 10 GHz. There are also tons of Avantek modules, in their standard round format, but a lot of them are custom part numbers with no specifications known. Since this particular project wasn't very sensitive to any of the parameters, I waited for a cheap one to show up with the right range and went for it. With a little investigating, it wasn't very difficult to determine the approximate specs for the module I purchased.