Reddit reviews EAONE All-Metal V6 J-Head Hotend Full Kit with 5 Pcs Extruder Brass Print Head + 5 Pcs Stainless Steel Nozzle Throat for V6 Makerbot RepRap 3D Printers

I had the PTFE inside the heat throat go bad and couldn't find the 3.5mm OD replacement tube anywhere so I replaced mine with this, $16:
https://www.amazon.com/gp/product/B074NX68MP/ref=oh_aui_detailpage_o05_s00?ie=UTF8&psc=1

Comes with 1x full metal heat throat and 3x replacements that use partial PTFE like the stock piece.

It's a little shorter than the stock piece so you'll need to raise your bed up a bit. I use a glass bed on top of the stock bed so that added some height, but I had to get some longer (4x M3 x 20mm I think) screws to replace the stock screws on the bed and now it lines up great. Full thread from when I needed help getting the bed to the proper height:
https://www.reddit.com/r/MPSelectMiniOwners/comments/8a9z0i/new_hot_end_too_short/

unfortunately the RepRap Champion clones aren't available anymore so I can't vouch for the quality of this particular clone, but just buy the whole thing, comes with replacment parts too

https://www.amazon.com/EAONE-All-Metal-Extruder-Stainless-Makerbot/dp/B074NX68MP/ref=sr_1_4?s=industrial&ie=UTF8&qid=1520361651&sr=1-4&keywords=e3d+v6

EAONE All-Metal V6 J-Head Hotend Full Kit with 5 Pcs Extruder Brass Print Head + 5 Pcs Stainless Steel Nozzle Throat for V6 Makerbot RepRap 3D Printers https://smile.amazon.com/dp/B074NX68MP/ref=cm_sw_r_cp_apa_i_qsqQCbFQ9MTFE

There are lots of sets pick one that has the stuff you need.

Just a cheap one.
I used this one: EAONE All-Metal V6 J-Head Hotend Full Kit with 5 Pcs Extruder Brass Print Head + 5 Pcs Stainless Steel Nozzle Throat for E3D V6 Makerbot RepRap 3D Printers https://www.amazon.co.uk/dp/B074NX68MP/ref=cm_sw_r_cp_apa_zw5NAb1C8GQ8V

However - it did come with a defective heater cartridge and Amazon did refund all of my money. I ended up using the original cartridge.

I also ordered a clone from Bangood as a spare - it took a while to arrive but looks identical.

Here's the one I grabbed

I'm still using the creality provided heater tube and thermister, as the heater tube that comes with this kit is 12V.

This appears to be the same kit but on the US amazon.

That is JUST the extruder. For Bowden extrusion, you also need a hotend. (that will be the part with the heatsink, fan, and nozzle)

I suggest this one, it's a clone of the official E3D v6. That said, I can't find anyone selling a replacement carriage to hold that hotend. It's traditional to just print one, so I don't know how you could switch to this setup without having a working printer to print the carriage in the first place.

Does your printer not work at all right now?