Another thing about DX is that the lasers vary considerably in quality. If you buy two 100mW green pens from them, one may be weak or mode hop, the other might be near spec. I have a 200mW DX green baton style laser that only puts out 100mW. Red lasers from DX seem to be consistant in power. O-like seem to look at their stuff before it goes out, so you are more likely to get a laser from them that functions at or near its' rated power. If you absolutely need a laser from DX, there is a member here who was arranging shipment of DX lasers to the US.
Any cheap laser companies are like that. o-like, rayfoss etc all of them can have shoddy quality lasers, it's just that Dealextreme have many thousands of customers per day, so they have no quality control.