We booked the week after you after research and booking the excursions thru RC when they were on sale we found the prices not back (we saved hundreds). The advantage of course is getting to back to the ship on time.
We did booked one 3rd party called Shore Excursion To Florence And Pisa thru Viator for only $136 for 3 of us.
Palma de Mallorca, Spain - We booked Drach Caves
Provence (Marseille), France - We booked AIX on your own
Florence/Pisa (La Spezia), Italy - We booked To Florence And Pisa
Rome (Civitavecchia), Italy - We booked Rome in a Day with Colosseum
Naples, Italy - We booked Sorrento $ the Amalfi Drive
All total was like $1,000 for 3 of us.