Have you thought of making it yourself?

Do you know someone who has a scroll saw or jig saw?

To make something like this, you would need some acrylic (1/8" should do it), some fine blades (perhaps specific to cutting acrylic) glue on crystals, some sandpaper (to clean up the edges) and an enlargement of your letter(s) -



Don't forget to include the spikes to insert into the cake. You can cut them off after if you want to display it on a wall.