The Wall Street Journal has done an excellent service by downloading the individual email files from the State Department's listing and making them accessible via their own search app. Even better, they've packaged the emails in convenient zip files.
Note: The WSJ has also published the code the use to do the scrape at their own Github repo:
https://github.com/wsjdata/clinton-email-cruncher
Why do you need your own copies of the emails when the WSJ's application works so well? It's a great tool, but it's still not as flexible as using regular expressions, which allow us to search by pattern, including:
$ is followed by numbers (to quickly locate places where money is mentioned)bflr