There are some TrueType fonts available at http://wuarchive.wustl.edu/systems/ibmpc/win3/fonts/truetype/
Look for gaeilge1.zip and gaelach.zip
There are also Mac fonts available at http://wuarchive.wustl.edu/systems/mac/macintosh/fonts/
On the Old English at the University of Virginia Page, you can find Old English fonts for Macintosh and Windows. Please note: "These fonts, intended for use by Old English students and scholars, are free. They may not be sold."
In addition to these companies, Dover Publications publishes several inexpensive books of copyright-free designs. Write for the complete catalog, or the Pictorial Archive catalog at:
Dover Publications, Inc.
31 East 2nd Street
Mineola, NY 11501