We don't post a flat number because the job changes with the door, and we're not going to pretend a 1960s single-panel door and a modern insulated double-wide cost the same to fix. What we can tell you is what drives the number up or down: spring size and type, whether the opener is original to the house or a later replacement, and how much of the track and hardware has to come apart to get at the problem.
Median household income across this service area runs around $82,276, and with over 111,000 households and nearly 38,000 owner-occupied houses in the mix, we see a wide spread of budgets and a wide spread of door ages on any given day. That's part of why we quote the actual job in front of us rather than a number off a website.
If a part is obsolete because the door is older than most opener parts still being manufactured, that gets explained before any work starts, not buried in the invoice.