We're not going to post a number here that doesn't hold up once we're actually looking at your opener - the cost of this job depends on whether it's a sensor, a board, a gear kit, or the whole unit, and whether the door hardware behind it is part of the problem.
What we can tell you is what tends to drive the decision in Catlin specifically. At a median household income of $67,344, we see more owners here choose a straight replacement over a string of small repairs on an opener that's already decades past its original install - the math on patching a unit built for a 1965-era garage against a new belt-drive opener often favors replacing once the second or third part fails.
One honest limitation: if the opener itself is fine but the spring or track behind it isn't, fixing the opener alone is a temporary patch, and we'll say so rather than sell you a part that won't solve what's actually wrong.