In a teaching book it suggested newspaper for dictation practice. It's usually fairly simple language. Always something new. Sometimes it has related material, such as banks being robbed over a certain period of time, so it makes it similar to the last time.
You could get one (like a large Sunday newspaper) and use that for dictation practice, any news print would suffice. You might even find free newspapers around town, but find one with articles.
Newspapers are sometimes hard to get and some people don't like the paper or ink. So you could just use online sources. You could even use television station websites.
Blogs may be another source of "news". That is an option, too.
"Gregg Shorthand had achieved the most extraordinary success ever attained by any system in the history of shorthand." John Robert Gregg, 1922