They have a pretty good quality for the money, try to do original designs and use good materials (D2 steel, bearings in the pivot and titanium with steel inserts).
Right now they are back on AliExpress after a short break and even have new blade style - a flat ground tanto, new hardware and a new pocket clip.
The Kwaiken Style can be bought here: http://goo.gl/nznzVU
Or here: https://goo.gl/pjGWUq
The new model can be found here: http://goo.gl/p4vruI
Best wishes and stay sharp!