Hi Brett !
The solution will be to follow the section "I sell packed products, how can I change "each" text in the product page ?" of the FAQ:
www.hikashop.com/en/support/documentation/faq.html
And instead of changing the line :
You'll have to change that line :
echo '<span class="hikashop_product_price_per_unit">'.JText::_('PER_UNIT').'</span>';
By :
if(isset($this->element->main)) echo JText::_($this->element->main->salemethod);
elseif(isset($this->row)) echo JText::_($this->row->salemethod);
else echo JText::_($this->element->salemethod);