How to define variables of type Price in the Service Catalog

Hi ServiceNow Community Developers,

I have a requirement to define a field called 'Cost' on the Service Catalog form. However when I looked at the list of available variable types on the Service catalog I don't see type Price which is the type that I think this field should be defined as. The default value for this field should be $0.00. Would you please advise as to what I need to do in order to get the desired functionality in this case.

Thanks,

Johannes