We don't have a published price list to hand you here - cost depends on whether it's one spring or two, the wire size the door needs, and whether a bearing or drum has to come with it. What we can tell you is that Park City's median household income runs $62,875, noticeably below the wider area's $113,697 median, and we price the job the same regardless of the address - the spring and the labor don't change by zip code.
One honest limitation: if your door is old enough that the track, rollers, and hinges are also worn out, replacing just the spring can mean paying for a return visit in a year or two when the next part fails. We'll always tell you if that's where your door is, rather than sell you a spring today and a track tomorrow.