@vogelcommando You can't go far wrong with seeing them at Guarulhos as they hold the studbook for the species and have quite a few of them.
Alternatively there is a single individual at Sorocaba zoo that is currently housed with a different marmoset species as his companion while attempts are made to secure more buffy tufted marmosets.
I dont remember whether Sao Paulo zoo house any of these species though , I certainly didn't see any last time I visited at any rate.
