We have extremely good options for repairmen here in Iowa. Besides Lee Stofer, who is a fine repairman that friends of mine have used, Merlin Grady in Waterloo is a superb tech. He recently aligned the slides on 2 of my trombones and did a superb job.

Here's a link to Merlin's website and some endorsements: http://www.merlingrady.com/testimonials.html