SharePoint licensing is a complex subject. As well as there being multiple product configuration options, license prices often depend on a number of factors such as the type of organisation, the relationship with Microsoft and/or licensing retailer etc. It is useful, however, to have a rough indication of how much a product will cost when planning a project. For example if you are interested in giving all internal users access to FAST search you are looking at roughly twice the licensing costs of an installation using the standard features