wat kinda goby is this
 

Yasha goby. Not always available, but the local shops usually have a couple every once in a while for around $30 by itself or double that if already paired with a pistol. Very tiny.

looks like a cool fish

http://www.liveaquaria.com/product/p...45&pcatid=1145

I would say closer to the $55 dollar mark around town.