Does anyone know where to find a taupe colored granite or composite sink? Seems that color has been discontinued and the only options are black, very dark brown, white, and nearly white.

Blanco's Silgranit sinks come in Biscuit. They're 80% granite.

Astracast's ROK sinks are also 80% granite/quartz and come in Sahara Stone.

You can always go with an integrated solid surface sink, too.