Hi Debbi, you will find more information about which pens work in the Accessories forum, more specifically:
http://www.entourageedge.com/forums/...-with-the-eDGe
http://www.entourageedge.com/forums/...ing-implements

You try to buy any of those online wherever they're offered (incl. Amazon), but this thread has more specific sites:
http://www.entourageedge.com/forums/...ge-accessories.