I got mine done at an independently owned exhaust shop - i paid $60 cash (one hour labor) to get mine welded... I don't think you can do much better than that for a quality job.
That price was with ME doing all prep at home, i.e. removing all undercoating and paint around areas to be welded, preping the subframes, and checking for fit. Welding was VERY easy for them to do once all the prep was done, probably only took about 40 minutes. I left my interior in, so we moved around quite a bit instead of completly welding a full bead around each end at once. It worked out great!