If the customer group got it’s own price in the article backend you should be able to give it a pseudo price as well.
As soon as the pseudo price field is filled it will display on the details page of the article as a small price with line through it next to the customer groups actual price.
Alternatively you can access the article prices via $sArticle object in smarty (inside the tpl).
Be aware: changes done to the article or its prices can require a cache clear before they show up on the frontend.