There are NO direct Extra Modules that can be added to QuickBooks Pro 2008 without upgrading to Premier packages directly. The upgrade cost is usually equivalent to the normal Retail Price differential.

Also view the QuickBooks Comparative Features Table by clicking HERE

For more information please contact TBA Solutions, who will assist you by quoting for the upgrade and advising you on the best course of action for your upgrade. The same principal applies should you wish to add on any extra users.