After you select your products, you also need to answer some questions about the size of your organisation and the type of licensing you require. Unless you are practiced in the black art of licensing, I'd suggest just accepting the defaults and treating the estimate as a rough guide. Contact your reseller for more accurate numbers.
Here are the figures that I got based on a 1,000 seat corporate deployment with Software Assurance (access to upgrades):
- SharePoint 2007 Server - $11,572
- SharePoint 2007 Server for Internet Access - $107,115 (AUD) - for hosting public websites. This license does not require Client Access Licenses (CALS)
- Standard Client Access License - $243 (AUD)
- Enterprise Client Access License - an additional $195 (AUD) - this provides access to the BDC, Excel Services and InfoPath web forms