Reddit reviews BIQU 3D-M6 0.4mm Brass Extruder Nozzle Print Head for 1.75mm Filament 3D Printer (Pack of 5pcs)

While the nozzle will wear, it's not significantly more than normal use. Hardened nozzles can help, but transmit heat less effectively. Replacement tips are literally about $1.50 each (BIQU 3D-M6 0.4mm Brass Extruder Nozzle Print Head for 1.75mm Filament 3D Printer (Pack of 5pcs) ) super easy to replace, and frequently cheaper/easier than cleaning.

I bought these ones. They are probably the same as what /u/jdgmntday listed but they ship to the US. They are a little bit longer than stock, so you have to re-level your bed; but they work great.

BIQU 3D-M6 0.4mm Brass Extruder Nozzle Print Head for 1.75mm Filament 3D Printer (Pack of 5pcs) https://smile.amazon.com/dp/B01J3BB000/ref=cm_sw_r_cp_apa_i_HpYVCbAT77F1A

FYI: I ended up ordering theses:

https://www.amazon.com/gp/product/B01J3BB000/ref=oh_aui_detailpage_o00_s00?ie=UTF8&psc=1

They're slightly longer than the original, but work great. No changes are needed to use them, though the extra length will take a few mm off the max Z height.

If you plan on maxing out the Z height, change setting in your slicer from 120mm to 117.

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Amazon Product | BIQU 3D-M6 0.4mm Brass Extruder Nozzle Print Head for 1.75mm Filament 3D Printer (Pack of 5pcs)
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I bought these about a month ago and they're working out well. The only issue is they're slightly longer than the original one so you'll have to get a spacer or lower the bed a bit