There's tons of great ones out there, but the ones who really take the time to do it right are usually self-employed. That means they're hard to find unless you know someone who used them before, and can squeeze into their overbooked schedule.
Most of the ones who work for companies have to work faster and cheaper in order to move on to the next project.
It's just tricky to build up a network of folks that really know what they are doing, and can fit you in when you just need a small project.