I haven't done a 190 series MB yet, but generally speaking, the pads are easy. The rotors are a bit different from American cars in that they bolt on to the hub, and you replace just the rotor part, keeping the old hub. To do this you have to remove the hub from the spindle, and this results in (typically) needing new wheel bearings and rear grease seal. This takes time, but is not too hard to do with the right tools. A search here on rotor replacement should turn up some information.

You can price the parts at this web site by clicking on "Buy Parts".

Pads,
Rotors
Wheel Bearings
Grease Seals

But if you get on it quickly, you may be able to avoid a rotor replacement.

Good Luck,
Ken300D

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1982 300D at 351K miles
1984 300SD at 217K miles
1987 300D at 370K miles