When that happens. It is time to get new fonts. Searching Google will give you a lot of results for “Free Fonts.” Most of these sites are filled with ads and such, and offer little in real “free” fonts.
I ran across a site that actually has a lot of good free font downloads. It is at http://www.webpagepublicity.com/free-fonts-a4.html. The site claims to have 6500 free fonts in a very long list. If you ever need any fonts. I would highly suggest this site!