We don't publish a flat number here because what you're paying for depends entirely on what's actually failed - a sensor realignment is a different job than a board replacement, and a board replacement on an obsolete unit sometimes costs close to what a new opener runs. We quote on-site, after we've actually looked at the unit.
What we can tell you: households in this area report a median income noticeably higher than the broader Wilmington service area, and we see that reflected in the kind of openers we're asked to repair versus replace - more belt-drive and battery-backup units than you'd find in older housing stock elsewhere in the region. Those units cost more to fix when the board goes, but they also tend to have better sensor and safety systems already built in.
We'll always tell you plainly when a repair isn't worth it - if your opener's original to a 1997 build and the board's gone along with a stripped gear, you're often better off replacing the whole unit than patching it piece by piece.