Invitation 'logo' search w/pic

Hi ladies,
I found this design on an invitation on the invite lady's website. It reminds me of a family crest but it's just a border circling the groom's last name. I really like the idea of it and would like to do the same thing except using a chinese double happiness character in the center instead. Do you know where I can find these 'crest' thingies so I can have some choices and photoshop something of my own together?

Also, anyone know if it costs more to add this to invites?

Thanks for your help!