The old site search from Google needs to be updated. Use the Search at the Upper Right, or use What's New in the center - it has a drop down arrow. You will need to change your Favorits by right click mouse and clicking favorites. Many of the posts in How to Use This Web Site are old so the links may or may not work. I have one hell of a lot of work to do!
Getting back to the original Question, Foundry supply outlets well have letters
for casting. They come by the box full, or you can order just the letters you need. You also mite get a few from a local foundry, if you ask.