Например, произвольный доступ к ценам
<span class="cena">5</span>
<span class="cena">6</span>
<span class="cena">7</span>
<script src="https://ajax.googleapis.com/ajax/libs/jquery/1.12.4/jquery.min.js"></script>
<script>
var price = $('.cena').eq(1).text();
alert(price);
</script>