Do you feel that they are warped or you just been told they are warped? You can tell if they are warped if your brake pedal shudders or pulsates when you stop. MB rotors for you car are pretty cheap, probably $50-60 each and easy to replace yourself. Check Duval Motor's website (link on my website), they sell MB parts at wholesale. You can get some aftermarket ones on ebay, Brembo is a good brand if you want a cross drilled look like the newer sport sedans. You may want to consider new pads since you are doing most of the work required to replace pad when you remove the rotor (the pads will literally fall out). You may want to consider aftermarket ceramic pads that will produce very little dust. Search the forum, there's a few brands and some fit certain years but I think Hawk makes ceramic pads for your car.
Also, sometimes I buy OEM parts at autohausaz.com, I've bought rotors from them for pretty cheap and they have free shipping if the other is over a certain amount.