JSFiddle - React, Tailwind, and code Playground

HTML

<span id="pricebox-right">Change this</span>
<br>
<select onChange="InsertPrice(this.options[this.selectedIndex].value);">
    <option value="vycvy">one</option>
    <option value="cyxcy">two</option>
    <option value="cyddxcy">three</option>
</select>

JavaScript

function InsertPrice(Variante) {
    document.getElementById('pricebox-right').innerHTML = 'US $ ' + Variante;
    return true;
}