The Magnetic Stirrer with Stir Bar (Model No. FIT0537) from DFRobot is thin and compact, and functions without producing noise or vibration. The power supply voltage needed to run this handy device is only 12V.
The product does not include power supply. DFRobot recommends a wall adapter power supply 12VDC 1A ( American Standard), with center-positive 5.5x2.1mm (0.22x0.08") barrel connector.
You can find a selection of such power supplies to choose from here: 12V Wall Power Supplies.