Replacing text string on Squarespace commerce

Replacing text string on Squarespace commerce

I'm doing a rush job as a favour for some friends who needed a site
pronto! Therefore I used Squarespace, and have done a partial use of
Squarespace commerce, as it's ready-made to do most of what they want.
However, being a retailer of expensive products (cars), they often have
products which are POA. Currently, Squarespace will not let me create a
product without a price.
The test site is at: https://james-wiseman-txkg.squarespace.com/shop/
I've used CSS hacks to create some of the other formatting (Change of
currency symbol etc) which I need. Is there any way for me to do a
search/replace by CSS or JQuery, which would just act upon a price of
$0.00 (or £0.00) and replace it with the text 'POA'?
Have seen other solutions on here using CSS and JQuery/javascript, but ont
sure how I do this with a particular string rather than DIV CLASS or TD.
Thanks!