Two copperC8 drop-ins from KaiDomain: http://www.kaidomain.com/product/details.S020291 , http://www.kaidomain.com/product/details.S020292 (100%? star? pill? at all? dunno, it says "Material: Be made of cooper" 
)
If the price is so low, could I get a Maratac Cu for a reasonable price please? Just thinking. (or DQG copper or something)
That photo shows Brass, not Copper. Copper is still fairly expensive, but the material still isn't what really adds to the retail cost of things made of pure copper. The real cost comes from the fact that copper is a Bi*c* to machine.
PPtk
So the meaning of the original text was lost in translation, you say...
Well, Brass has 'some' copper in it ;)
Unfortunately, they can claim what they want, as evidenced by the outrageous claims they do with lumen output on lights. There is a small amount of copper in brass, but brass is a much worse heat transfer metal than aluminum. They use it because it's easy to work with in a lathe and it's probably cheap there.
Thermal Conductivity of metals
Pure copper isn't going to be found in Chinese heat sinks or drop in's. Better off to make them out of aluminum yourself or copper pipe fittings and solder. Brass sucks as a heatsink and Beryllium sucks also.
The Chinese aren't buying and hoarding copper to turn around and put it in cheap flashlights. Seriously, they're buying a crap load of copper and the demand isn't even increasing or at least it only is slightly.
I'd rather see aluminum in the budget lights because then at least I know it isn't brass 8)