I use :
$product->getPrice();
to get the unformatted price that I can calculate "quantity X price" with ajax.
I want to reformat the total in the current locale and currency. How can I do that?
I think Google could have answered your question ;-) See http://blog.chapagain.com.np/magento-format-price/.
You can do it with
$formattedPrice = Mage::helper('core')->currency($finalPrice, true, false);