User Group Pricing When Product Has No Price?

Hello,

Is it possible via a code change, setting somewhere or plugin, to allow a product that doesn't have a price, but does have a "call here for price" to have a price if you are logged in in a specific user group.

I can make it work as I wish if the product has a price listed on the general tab. But if that is set to 0 the quantity discounts trick (set to 1) doesn't work.

Any ideas?