Classified CPT

Hello support, and anyone who can help

First off I fully realise Geodirectory in not a classifieds plugin but I see that some people are using it for this purpose. I think a classified section would be a good addition to the directory site I am working on.

Am currently working on cpt for this but am having some problems with formatting the price field. I cannot find a way to insert the £ symbol into the field, nor find a way to use a comma to separate thousands and hundreds.

What is the best way to format price?

Are these things possible?

Any help will be much appreciated

Thanks