I am surprised this hasn't been mentioned here before but I searched and couldn't find it.
HKnowstore is now selling the Gans III speedcube here
. It has a special "octopus" core that doesn't use any screws. Instead you screw the nuts directly onto unthreaded arms with the supplied spanner. I know several people have struggled to assemble it so I made a video tutorial
. The puzzle itself has very good corner cutting and seems to work fine.