Buy same product with different price

[gkp13]

Hi. I want to do the following:

Some customers can buy a product without entering username & password.
Some specific customers can buy the same product (from the same stock) with different price by entering username and password through a "hidden" page.

Is this feasible? Can you help?

[GJC Web Design]

Shopper Groups - no need for hidden pages etc -- if they login and are a member of a SG they see their own prices