Magento Open Source, 1.9.x
Group Price Attribute

The group_price attribute gives you the ability to offer a different price to members of a customer group for any product type that is specified in the attribute’s Apply To property.

Attribute Properties

To set up a group price:

1. On the Admin menu, select Catalog > Manage Products. Then, open the product in edit mode.
2. In the panel on the left, select Prices. Then, do the following:

Group Price
a. Under Group Price, click the Add Group Price button.
b. Select the Website to determine the scope of the setting.
c. Choose the Customer Group that is eligible for the group price.
d. Enter the Price of the product for members of the selected group.
3. When complete, click the Save button.