If the price in beginning of paragraph always, you can use this:

(?s)^\$?\K\d[.\d]+

Hello! Your regex finds set of parentheses only in the end of paragraph, but my regex finds find the last set in anywhere

\([^)]+\)$
\( open parentheses
[^)] any character except the close parentheses (this form is called negated character set)
+ one time and more (but you should use here +? to make it shortest match)
\) close parentheses
$ end of paragraph

.*\K\(.+?\)
. any character
* zero or more times
\K keep all the before outside the matching
\(.+?\) the same above

Try to use “Space Between Paragraphs Using Same Style” option and make it “0”

Or this:
+(?=\r)

Try to do this update:
https://helpx.adobe.com/indesign/kb/search-issue-in-long-documents.html?fbclid=IwAR2cPaXP_DR-eKuEQusBDywIhtfk4A3j_FenPQ_k35ObnuXqwsqaiXkU8PE