If you do find one at your LFS make sure that it doesn't have a pinched stomach. A clear sign that it hasn't been eating well and may be on its way out.
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Rainford's Goby
Aquarium Fish: Gobies of the Genus Amblygobius | Advanced Aquarist's Online Magazine
The one I had would wander around the tank and sift sand all day.They stay small, they are peaceful, and they will not make a mess or cloud you water to much.