A Chinese company had started to flood ebay with fake LEGO DC and Marvel Super Heroes minifigures which come in packaged boxes. Please be aware that LEGO do not sell individual Super Heroes minifigures unless they are in polybags.
The print quality and plastic is very poor quality, which is reflected in the price. They can be easily identified as LEGO fakes by their feet which are shaped.
They have currently made Iron Man, Wolverine, Captain America, Hulk, Thor, Superman, Spider-Man and Batman. Counterfeits are illegal, so I would expect LEGO to take the appropriate action.