Accept the value sent from Sesame and use Word to format the field.

Go to the field in Word and set the format for that field to Money..  See the Word Help secition on MergeFormat. 

You may need to toggle the Field View to see the Format code vs. the field name.

Try following these steps: 
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1.  Open your Word merge document.

2.  Click on the field and press Shift F9, or press Alt F9 to toggle thel field code. This wil show the field code rather than the value.

3.  Click at the end of the field code and add the formatting code for currency.  For example, to format Price:

4.  Change FROM:
{MERGEfield Price}
TO:
{MERGEfield Price  \#$#,###.00}
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This should have Price show up as $  $25,000.00

Also see Sesame Programming Guide pages 278,279.