In response to Rolohaun's review of the FLSUN V400 you can see here:
https://www.youtube.com/watch?v=WNBbY0BPOJ0
To clarify, I have the utmost respect for Rolohaun 3D and his projects, i just simply know the V400 very well.
Here are some spare parts at reasonable prices....
Stock style hotends : YT wont allow my channel to post links yet :( Will Update...
The CHC Hot end : This is actually only $29 on amazon right now