If you have a scrapbooking store nearby sometimes they have stuff for invitations.
I did my wedding invitations myself, I could kick myself for not being able to remember the name of the company I bought the invitations from, if I can find it I will let you know.
I looked through the patterns they had, picked one out, and then I bought some paper from a craft store to print the info on, and I tied a ribbon through the paper to attach it to the invitation (if that wasn't too confusing to try to picture
)