What a roller job runs depends mostly on two things: how many rollers need replacing and whether the track needs straightening or swapping alongside them. A full set of nylon rollers costs more upfront than steel, but they run quieter and don't groove the track the way steel does over time, so a lot of owners in Elmhurst - where median household income runs well above the rest of the area we cover - go with the nylon upgrade rather than the cheaper steel match.
We don't publish a flat number here because the track work varies too much house to house to make one honest. A door with light wear and no bent track sections costs less than one where the track's been taking a beating for years. We give a firm number after we look at the door, not before.
One thing we won't do is sell a full roller replacement when only two or three rollers are actually shot. If the rest are still round and quiet, we replace what's worn and leave the rest alone.