Warped brake disc, how much does it cost to fix?

Since people mentioned prices, let me give you a practical tip: before you head to the mechanic, check if it's just dirt buildup on the disc itself, because sometimes a good rinse with pressurized water does the trick and costs nothing! Now, if it's actually warped, I agree that replacing it is worth more than fixing it, but it doesn't hurt to get quotes from two or three shops because the price variation really is huge depending on who does the work. And one important thing: if you leave it with a warped disc for too long, it damages the caliper and then it really does get expensive!