This guy's stuff is from Taiwan. They're pieces to go to sets for Si Dan. They're basically a LEGO clone, but with higher quality plastic than what you find in mainland China. They had a variety of sets a couple years ago, but I think a couple lawsuits have made them reduce their inventory. From what I understand, the minifig weapons and accessories are pretty awesome.
I've wanted to get a couple orders of their stuff myself, but I'm just a poor college kid making his way through undergraduate studies.