Perhaps the following formulas can help you:
=ImportXML("http://...","//div[@class='product-info-price']//div[@class='left']/text()")
Or
=INDEX(ImportXML("http://...","//div[@class='product-info-price']//div[@class='left']"), 1, 2)
UPDATE
It seems that not properly parse the entire document, it fails. A document extraction, something like:
<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">
<html>
<div class="product-info-price">
<div class="left" style="margin-top: 10px;">
<meta itemprop="currency" content="RON">
<span class="pret" itemprop="price" content="698,31 RON">
<p class="pret">Pretul tau:</p>
698,31 RON
</span>
<div class="resealed-info">
<a href="/resigilate/componente-pc/placi-de-baza/" rel="nofollow">» Vezi 1 resigilat din aceasta categorie</a>
</div>
<ul style="margin-left: auto;margin-right: auto;width: 200px;text-align: center;margin-top: 20px;">
<li style="color: #000000; font-size: 11px;">Rata de la <b>28,18 RON</b> prin <a href="http://www.marketonline.ro/rate-sapte-stele?amount=698.31#brdfinance" title="BRD Finance" target="_blank" class="rate" rel="nofollow">BRD</a></li>
<li style="color: #5F5F5F;text-align: center;">Pretul include TVA</li>
<li style="color: #5F5F5F;">Cod produs: <span style="margin-left: 0;text-align: center;font-weight: bold;" itemprop="identifier" content="mol:GA-Z87X-UD3H">GA-Z87X-UD3H</span> </li>
</ul>
</div>
<div class="right" style="height: 103px;line-height: 103px;">
<form action="/?a=shopping&sa=addtocart" method="post" id="add_to_cart_form">
<input type="hidden" name="product-183641" value="on"/>
<a href="/adaugaincos-183641" rel="nofollow"><img src="/templates/marketonline/images/pag-prod/buton_cumpara.jpg"/></a>
</form>
</div>
</div>
</html>
works with the following XPath query:
"//div[@class='product-info-price']//div[@class='left']//span[@itemprop='price']/@content"
UPDATE
It occurs to me that one option is that you can use Apps Script to create your own ImportXML function, something like:
/* CODE FOR DEMONSTRATION PURPOSES */
function MyImportXML(url) {
var found, html, content = '';
var response = UrlFetchApp.fetch(url);
if (response) {
html = response.getContentText();
if (html) content = html.match(/<span class="pret" itemprop="price" content="(.*)">/gi)[0].match(/content="(.*)"/i)[1];
}
return content;
}
Then you can use as follows:
=MyImportXML("http://...")