A good tune is going to cost you money... no way around it... especially places that charge by the hour on the dyno.. I'd say 100-150 is pretty normal.
4-5 hours they'll be taking their time which is probably a good thing. The more time they spend at all the different rpm's and load sites checking things out the safer your tune will be and it will make more power.
Just bite the bullet and get it done right once.
