Hello Ivana,
First, you will have to bring up the Propery Grid for the column. You can either do this by clicking on the field in the Data Headers in the Designer screen or go to the pivot grid's designer wizard. In the wizard, click on the field you want to format in the SRPivotGrid Fields column on the Fields screen. Under the Appearance section, expand Cell Format. Type in ${0:n2} . Next, select Format Type 'Custom'. This should give you a dollar sign and the rounding that you need. See the example below where I did the same for my subtotal column.
Greg