The Saarland University has its own Kindergarten (Kindertagesstätte) and day care center in the Mensa building with a playground in the forest behind the Mensa. The Kindertagesstätte is run by the Studentenwerk. The fee depends on different factors, and on whether you are a student or not. The links below take you to the Kita's pages (in English).
General information on the Kita
The Catholic Kindergarten in Gaußstraße is apparently more expensive, but the fee always depends on the age of your child, and which care plan is needed. Get more information on prices:
Kath. Kindergarten
Thomas Morus
Gaußstraße 3
66123 Saarbrücken (map)
Tel: 0681-3908502.