Hi,
Yes.
First, when you edit / crease a price in a product, you have an "access level" setting. With it, you can restrict the price to only users of specific user group(s).
So if you configure only one price restricted to users of the wholesale user group, other users won't be able to see the price.
Instead, they'll see a text "free" which you can customize with a translation override (
www.hikashop.com/download/languages.html#modify
).
Then, if you have the "display add to cart button for free products" setting turned off, the add to cart button will only be available if the price is displayed to the customer, so only users from the wholesale user group will be able to purchase the product.
Finally, if you want to display the retail price on the product page regardless of all this, you can enter it in the "retail price" setting of the product.