I used Yelp's request a quote and immediately got 4 calls or emails - even though it was a Saturday.
For a simple broken spring the quotes ranged from 185 to 285 for the two springs (since if one goes the other is not far behind).
I went with Triple B for a couple of reasons ...
1.) They were the lowest price.
2.) They provide a lifetime guarantee on the springs and 5 years on the labor - though if the LLC shuts down that is null and void - but Rusty's son will probably continue the business when Rusty retires.
3.) The springs themselves are rated for 80K cycles for our 7' door and should last much longer than what the builder put in.
Rusty checked the cables and bearings and saw no reason for replacement.
Another spring broke at our other house and Rusty's son was able to come out an hour after the call. He replaced the two springs, lubricated the hinges, and adjusted the opener - for $185 total. Excellent. I wish all repairs were this quick and reasonable.