Their initial goal was to build 2,510 Little Free Libraries to match Andrew Carnegie's philanthropic support of 2,509 public libraries in the late 1800's and early 1900's. That goal has been significantly exceeded and in 4 short years there are over 15,000 Little Free Libraries all over the world.
The website even has an interactive map so you can see if there are any Little Free Libraries in your neighborhood.
While you are able to purchase kits from Little Free Library, some people have crafted their own. The creativity and craftmanship of some of these little libraries is outstanding.