JSFiddle - React, Tailwind, and code Playground

HTML

<link rel="stylesheet" href="http://ajax.googleapis.com/ajax/libs/jqueryui/1.8.4/themes/ui-lightness/jquery-ui.css">
<p id="target">
  <span><sup>$</sup>50</span>
</p>

JavaScript

var num = $("#target > span")[0].lastChild.data;

alert(num);