I agree with capt7310 and with two additions, I have them cut down two wardrobe boxes to fit the slot machine with one inverted on the other to become a double boxed situation and they also will use an expandable foam if asked to that once it is placed in the box appropriately expands and actually fits around the handle, Etc. to make a very secure package, also have the seller take all the coins out of the coin tube abd the front jackpot or you'll be digging coins out of places they shouldn't go into!
I have been using FedEx for many years and have never seen damage occur as with the other guys!
With shipping out a lot a personal relationship with your FedEX location and shipping member is also a big plus and setting up an account with them is great as well!
As for expense they are very competitive and as capt7310 mentioned if they handle the entire process, packaging, shipping and insuring, if worst case scenario occurs they are a lot easier to deal with, especially if you have an account with them unlike the other guys!
MONTI