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My daily driver came with front disc brakes that were too small for the vehicle and would regularly warp the rotors before 20k miles. I simply bought the slotted/drilled rotors from R/A and sent them to be Cryo treated. Now they can go 50k+ easily and the cost is quite reasonable, it was less than $100 for both rotors to be treated so the shipping cost was more than anything else. So my next pair will go right to the Cryo guys and then ship them home.
Find somebody who sells the rotors with slots only and have them shipped directly to the Cryo treatment facility and have them ship them to you. It is easier that way.