Help. removing price

[Alex.ReLaXCom]

Hey guys,
I realy need somebody's help in this problem.
First of all I'm not english so please excuse my wrong spelling.:-)
I'm the "manager" of one site that uses Presta shop.
I'm only 20 ..so I didn't have the chance to study Presta shop fully.
So..I don't know if I can give u the link to the site so that u can see what I'm talking about, but my problem is that the products that I post , change theyr price evry week..so I hope you understand that changing 200 products evry week isn't that easy:-))
So my boss asked me if I can delete the price of the product......leaving it priceless....
I've tried to look for something..but I didn't want to destroy the site :-)
Can someone help me?
Thankyou ><..