Hmm, I swear I posted the video. Anyway:
My advice is buy them from bidproduct, or see if Lutach is going to be getting them anytme soon (having issues with the actual factory supplying him the correct motors for testing). Cheaper than a feigao, yet the same quality or slightly better even.
You cant buy them in the UK- they come direct from China, but the good news is they ship anywhere in the world, shipping is cheap, and customs forms are usually marked at a nice low value to avoid import fees etc.
I'd suggest the smooth can versions if you have limited gearing room, or the finned can version if that isnt an issue for your setup.
Bidproduct