В самом начале шаблона productPrice
{if !$priceDisplay || $priceDisplay == 2}
{assign var='productPrice' value=$product->getPrice(true, $smarty.const.NULL, 6)}
{assign var='productPriceWithoutReduction' value=$product->getPriceWithoutReduct(false, $smarty.const.NULL)}
{elseif $priceDisplay == 1}
{assign var='productPrice' value=$product->getPrice(false, $smarty.const.NULL, 6)}
{assign var='productPriceWithoutReduction' value=$product->getPriceWithoutReduct(true, $smarty.const.NULL)}
{/if}