We don't post commercial pricing here because a shop-front roll-up, a warehouse sectional door, and a loading dock door with a commercial opener are three different jobs with three different parts lists - spring size, cable gauge, and opener horsepower all move the number. What we can tell you: a straightforward spring or cable repair on a door from Rendon's 1990s building stock costs less than replacing an opener's logic board, and both cost less than a full door swap.
One limitation worth saying plainly: on a handful of older commercial doors from that era, the original torsion hardware is sized to specs nobody stocks new anymore. When that happens, we tell you straight rather than force a part that won't hold tension - sometimes the honest fix is a full hardware swap even if the panel itself is fine. Get a number from us after we've looked at the door, not before.