Superlux HD681 for $20, HD668B for $29, HD660 for $38 [free shipping from China]

Some of the Superlux headphones are also participating in the GearBest 11.11 festivities, with free slow shipping from China. Among them:

+ Superlux HD681 for $20
+ Superlux HD668B for $29

The very Beyerdynamic looking Superlux HD 660 is out of stock and cannot be ordered at GearBest, but it goes for $38~ with free shipping from China from a couple of sellers at Ali Express.