We don't have a fixed number to quote here for Maple Valley specifically, and we're not going to make one up. What we can tell you is what drives the cost: how many rollers need replacing, whether the track has damage from a seized roller, and whether you want stamped steel (cheaper, louder, shorter life) or nylon with sealed bearings (costs more per roller, runs quieter, lasts longer under the same cold-moderate winter conditions this area gets).
Maple Valley sits about 8 miles out from our Kent shop, and that travel is factored into the job the same as any call in this stretch of the service area - we're not a Maple Valley branch, we just cover it. For a full breakdown of what a roller job actually runs and what changes the price, the Kent page has the numbers we can stand behind.