Binco is a cheap clothing store that first appeared in Grand Theft Auto: San Andreas.
Grand Theft Auto IV
In Grand Theft Auto IV, the Russian clothing shop originally was going to be Binco but was changed for unknown reasons, as seen in the "Looking for that Special Someone" trailer. If Niko walks into Modo wearing certain outfits from other stores/sources, the sales assistant will ask if he's been in "a Binco explosion". Bags NPCs carry sometimes have a Binco label. Binco Yankees also appear in traffic.
Vice City's Serbian
In Vice City's Serbian, Binco is only an enviromental detail on the map. It may be usable after future updates, though. When exactly is currently unknown.