Yes, you can send laundry out..it is an excellent service. You put it out one day, it returns early afternoon the next.
The costs, I don't remember everything, a few bucks for a tshirt, less than that for underwear, socks, pj's, etc.
Everything comes back perfectly pressed..it is excellent.
We also don't have to worry about packing neatly, as we use the pressing service when we get on the ship. Once our luggage is delivered..anything that is too wrinkled we throw into a laundry bag, fill out the tag and hang it on the door. Everything is ready the next day and you are good for the length of your cruise.