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The stock nozzle has an overall length of 10mm.
Threads are M6x1.0 with a 5mm length.
Nozzle opening diameter is 0.4mm
Malyan 3d printer 0.4mm Nozzle of M200
Exact match but cost prohibitive. $19.05 USD (Nozzle: $5.50 + Shipping: $13.55)
Malyan M180 - Replacement Tip 0.35
Exact height and thread size but the nozzle opening is 0.35mm. It is a bit expensive for a single nozzle though.
3maker J-head Extruder Hotend Copper Volcano Nozzle 0.4mm for 3D Printer 1.75mm Filament
These nozzles do not have the same thread length as the stock nozzle. The threaded side is 1.17mm shorter than the original. You can get these nozzles to work by tightening the heat break/filament guide all the way to the threaded half of the nozzle. If you miss this step filament may ooze out the sides. No idea as to why the product title has “Volcano” in it. This nozzle is far too short to be an E3D Volcano nozzle.
Monoprice has said that they are hoping to have replacement parts available for purchase from their site by the end of 2016 or first quarter of 2017.
In the meantime any nozzle with M6 threads will work. You may have to make adjustments to the bed and/or heat break or with a Z Spacer.