Do you prebook extra's

[Janet&Carl]

I am a regular MSC cruiser and when we prebook extra's like a spa package or internet package you get a reduced price to onboard prices.  Like $140 spa access for a week instead of onboard per day charge which is much more.  Do they do something similar on Costa.  We have a suite booked so already have the drinks.  We like specialty dining ( we didnt get this included on our last Costa Neo Romantica Cruise - although we were not in the mdr we were in the corridor on the way to it).  Are there any deals you can get for specialty dining?   I also would like the rear (reserved) sun deck and spa access druing the cruise.  Can these be pre booked ? are they any cheaper to do it this way or do you spend the same ? Any advice is appreciated because the costaasia site that we get directed to from Australia is woeful.