OpenCart-Hellas 

<span class="price-new"><span itemprop="price" id="price-old" content="<?php echo round($price_value, 2); ?>"><?php echo $price; ?></span><meta itemprop="priceCurrency" content="<?php echo $currency;?>" /></span>

<span class="price-new"><span itemprop="price" id="price-special" content="<?php echo round($special_value, 2); ?>"><?php echo $special; ?></span><meta itemprop="priceCurrency" content="<?php echo $currency;?>" /></span> <span class="price-old" id="price-old"><?php echo $price; ?></span>

<span class="price-new"><span itemprop="price" id="price-old" content="25.0000">25,00€</span><meta itemprop="priceCurrency" content="EUR"></span>