We're not going to hand you a number here, because the honest answer is it depends on what's overhead. A single torsion spring on a standard door costs less than replacing both springs on a heavier double door, and wire gauge and wind length vary by door weight and headroom, not by which street you're on.
What we can tell you about Manchester specifically: median household income here runs about $108,242, a bit above the wider service area's $102,693, and that tends to show up in which repair people choose - more owners here ask about replacing both springs at once rather than patching the one that broke, since a mismatched pair wears unevenly and you're often back out in a year or two anyway.
The other cost driver is what's underneath the spring problem. If the drum or cable took damage when the spring let go, or the opener gears got chewed up from being run against a dead spring, that adds parts to the job. We quote after we see the door, not over the phone, because guessing wrong either way isn't fair to you.