I agree with JT - learn to work on your car. Not many jobs easier than doing disc brake pads.
As for the cam seal - if the labor is $90, that sounds like they're charging about 1 hr, which means it really takes about 30 minutes (or less).
Who has told you that your car "needs" all this stuff? The service writer at the dealership? You do know he works on COMMISSION don't you? So you are paying HIM, the MECHANIC and the DEALERSHIP. So are all these items REALLY bad or is someone looking for a little fatter paycheck?
On my 93 Concorde with 125K, I ran one pad down to where it chewed the rotor pretty good. I cleaned the burrs with sandpaper, bought some lifetime warrenty pads from AutoZone and have another 50K on a rotor that "should" have been replaced. (not saying DON'T put on a new rotor IF you really need it - I just couldn't get one that day).
Single Mom friend at work has a son off at college 90 miles away. He called with a $900 brake estimate from a Ford dealership on his 2000 Explorer. I happened to have a backyard mechanic friend (used to work at a dealership til his Mom got sick) who lives near the college. The $900 brake job wound up costing $100 labor and $125 for parts. The dealership was replacing EVERYTHING whether it needed it or not.
Maybe you need to find a backyard mechanic you can trust and get a second opinion & price quote.