The real issue is how much mulch and how far and difficult to move it to where it has to go. If less then 10 yds- then just do it yourself. Like I mentioned, I do over 40 yds each year. But I wouldn't recommend that to many.
Also for consideration, a pre emergent and a weed barrier. Also, if you hire someone to do it, it is usually labor cost = mulch cost. I have also always found they go way too thick. Not a bad idea your first year for a full 4 inches but it is overkill in later years.
One more thing...never, ever use red mulch unless you are a shopping plaza.