Oracle iStore displays prices for site products in both the catalog pages and the shopping cart. All item prices are retrieved from price lists; thus, every Inventory item for sale in your sites must appear on at least one price list. By setting 'IBE: Use Price list Associated with Specialty Site' profile option, you can specify whether the Pricing Engine retrieves site-specific price lists or retrieves the best price from any available price list.

• If the profile option is set to Yes, Oracle iStore retrieves prices from the site-based price lists specified in the Site Administration Application Pricing page for four main user types: B2C, B2B, Guest, and Partners. This is also called site-based pricing. In this case, Site ID is passed to the Pricing Engine.

• If the profile option is set to No, Oracle iStore passes a null price list, with Party ID,
Account ID, and Site ID to the pricing engine. In this case, the pricing engine searches through all eligible price lists to determine the "best price" for which the user qualifies.

Oracle iStore caches prices in the catalog for site-based price lists and guest users. In the
shopping cart, which retrieves prices through Oracle Order Capture, prices are not cached.

Regardless of the value set for IBE: Use Price List Associated with Specialty Site, for walk-in users, the default price list is always determined by the price list set in the Site Administration UI. In addition, guest users always see the cached prices.

For more details on basic and advanced pricing, check below pages
http://www.oracleug.com/user-guide/order-management/basic-pricing
http://www.oracleug.com/user-guide/advanced-pricing/advanced-pricing