有没有办法隐藏特定客户群的Magento的RRP /旧价格？

I need to hide the RRP/Old Price on Magento for just one of the customer groups on the store - is there a way I can display none the price if a certain customer group member is logged in?

I would suggest adding an update to catalog/product/price.phtml to add a containing div with the current customer group as a class / reference so that you can add CSS to display none. Alternatively, you could actually wrap the code in this logic.

$customerGroupId= Mage::getSingleton("customer/session")->getCustomerGroupId();

Will get you the Group ID of the current customer session (remember, Magento tracks "Not logged in", so this should always return something). You could then echo a class like this onto price-box or a wrapping div

class="customer-group-<?php echo $customerGroupId;?>"