Depending on what fields you need to export,
Open Automator and create a new workflow.
From the Contacts Library,
Drag in a Get Selected Contacts Items (set it to People)
Drag in a Get Contact Information {set it to Spreadsheet (tabs) }
Select the items you want to export. If that isn't all you need, then this isn't suitable.
From the Text Library,
Drag in a New TextEdit Document
Open Contacts, Select all the contacts you wish to export, then run the workflow in Automator.
It will open a new text document with the fields separated by tabs.
Use find/replace to change the tabs into commas.
You may want to search for commas before you replace the tabs, and enclose the entire field that contains a comma with "".
