Getting rid of the resonator is cake for any shop, think it will depend more on what you are going to do after the cut? Are you looking to have the pipe extended or just a simple turn down? If you do a turn down then you have to get a blank valance or it will look silly.
Anyways, IMO as a guess I wouldn't pay more than $40-$50 labor wise then whatever materials you would need for the route you choose.
rick ive dealt with best muffler shop 385-1934 there downtown 33 n 21st st 89101 . you may want to consider muffler delete and leave resonator. or better yet buy a cutout this way you can control when you want it loud .let me know if you want to hear it in person .