FxFactory is an excellent shot for all your FCP X needs. I have used them for plugins for years now, highly recommended!
"Noise Industries partners with a global array of developers to produce a steady stream of new and updated effects. This has been made possible by creative use of Apple’s built-in development tools such as Quartz Composer and Motion’s template creation and publishing features. The latter has allowed more tech-savvy creatives to become their own effects designers. Much like suppliers have developed customizable After Effects projects and sold them as stock clips, now users can create Motion templates that appear as a filter, transition, title, or generator. Noise Industries has partnered with a number of these designer/developers to populate its FxFactory repertoire."
You can also circle them here on G+: +FxFactory Plugins for Final Cut Pro, Premiere Pro, AE and Motion #FCPX