I have no idea about the IRO specs, but in my experience, I have:

1) Never spent more than 60 cents per spoke, even when they've been custom cut.
2) Never paid a dime for measurements.
3) Never waited more than a few hours for spokes.

In regards to #2, the LBSs I have gone to have either, entered the hub make and rim make into some computer program and got the spoke length OR took out a tape measure and did it the ol' fashioned way.