Or would anyone have a list of frum newspapers/websites that cater to frum people in the business world.
If by “frum people in the business world” you actually meant “people in the frum business world”, then by all means limit yourself to frum newspapers and websites.
However, if you are searching for a job in the generic business world, then you may not want to limit yourself to these publications, as most employers use mainstream outlets to list their job openings. Normally, as a job seeker you should keep track of the primary venue used by companies hiring in your specific line of work. Otherwise, you risk hearing about the position late in the game.