We don't quote a number sight unseen, because a sensor realignment and a full opener swap aren't the same bill, and guessing does nobody any favors. What we can tell you is what tends to drive the cost here: extension spring pairs are generally less expensive per spring than the torsion systems common on older housing stock, but replacing both at once (which we recommend, since the second usually isn't far behind) costs more than a single spring job.
Opener circuit boards sit in a middle range - cheaper than a full opener, more than a sensor fix. If the board is obsolete, a new opener head is often close in price to sourcing a rare board anyway, and comes with a warranty the old part never had.
Marion's median household income runs a bit above the wider service area, but that doesn't change what the parts cost - we price the job, not the zip code.