Located in the US the Font Shop was founded by Erik Spiekerman and Nevill Brody in 1989. They have a huge library of over 150,000 fonts from their own archieves and other foundaries. Prices range from 60 to over 200 dollars.
A competitor of the Font Shop is the Font Factory, their price range is from 6 to 50 dollars. While they might have a greater price range, they dont have the extensive catalouge and have a few cataories with no fonts listed at all. While the Font Shop might be on the pricy side its worth it when it comes to selection.