It just depends how you're listing products... I don't know if you're using the core catalog (in which case you can turn the price off altogether in the table display settings) or a custom solution with Views or just the /products listing. You just need to find the appropriate method for whatever you're using, and that may mean making your own with Views. You can alter the page display however you want, and through the product display settings you can turn off price displays altogether (but not per class).