How much can I expect to pay to have front brakes/front rotors/one caliper replaced? I also need to have the engine mount replaced. I also have a broken suspension bar (that's not the proper term, but I can't remember). The shop said that even though only one is broken, both should be replaced at the same time. How much do you think for all of that?

 

There are many factors to consider when providing any type of estimate for automotive work. Some of them are;
What the tech finds when he/she disassembles the parts because pieces can be worn that are not visible when assembled
It is a little amusing when someone requests an approx estimate when we aren't sure of what the part/parts are that require replacement
Usually the better way to arrive at a reasonable figure is to obtain a few estimates from different shops that perform that type work.
Different areas of the country charge different labor rates
I know all this didn't answer your questions, but it should give you some idea why it is so difficult to throw out a number, hope you understand.