masked gobies

I live in IL, USA and have been looking around for a masked goby. Does anyone know trusted websites that ship them out or pet stores that usually have them available?

I have an IM14 (14 gallons total, probably 13 of that in the display) that sits on my desk. I currently have three sexy shrimp, two Pederson't anemone shrimp, one snapping shrimp and a peppermint shrimp. Oh, and four masked gobies (tiny fish, around 1 inch long) The tank doesn't look crowded but...