Replacing nozzle on the mini

Hi, I have printed 3 reels of bronze filament from colorfab all has been going well until now. The filament is collection on the nozzle and then stops extruding. How and where can I get a new nozzle and how do I install it?

I have that thread bookmarked for when I end up wanting to swap mine around. The Hexagon nozzles are available from a few vendors, and E3D nozzles are said to work as well.