I think your question was about cost. An electrician will likely charge between $50 and $75 per hour for labor and parts will be on top of that.
The rate depends on the quality of the company. A good electrician should have five switches changed in about 2 hours max. I am an accomplished amateur electrician and I could do it in about that time.
Be sure to ask them how long they expect to take! It is easy for a service worker to pad the time clock when you don't know what he is doing. It shouldn't take him more than 15-20 minutes per box, maybe less.
I will add this. If after the dimmer switches are installed, you experience some unexplained interference on some of your radio or television appliances, you can suspect the dimmer switches. They really do give off an unwanted field of electrical interference. Not always, but at least remember this.
I have an electic digital clock on my bedstand. When my wife is in the master bath with the (dimmer controlled) light on, my clock has an aweful BZZZZZZZZZZZZZZZZZZZZZZ. The instant that she turns the light off, the buzz stops.
JLK
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