On survival. Its rather difficult to get money. So I was wondering if there could be a plugin that gives us jobs and we could work for the money.

http://dev.bukkit.org/bukkit-plugins/jobs/

I'd like this or maybe lower the prices jeez $100000 for a mob spawner? what ever happened to the old $5000?

People could grind for drops and sell them.

I find mining the easiest way to get money

Jacob, there could be a cooldown. :o

That would still be an issue; no matter how you put it there is a set point where someone will attain more money than the other people simply because they grind spawners. The price isn't being adjusted.