you can set up for any product if you want (allowed) to display no-price/retail-price/special-price in categories, product page or by any module (featured, special, latest, etc.) or display the final price only in the shopping cart
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there is only one special instruction: run this script to modify your database:

ALTER TABLE `oc_product` ADD COLUMN `display_price` ENUM('DISPLAY_ALL','DISPLAY_RETAIL','DISPLAY_NONE') DEFAULT 'DISPLAY_ALL' NULL AFTER `shipping`;

change prefix for table ('oc_') if you use something different. enjoy, any problem, comments, please contact me at info@alcher.info