Cruising on the Explorer of the Seas in July.
I was able to book an Airport transfer from Marco Polo Airport to Ravenna through RC for $45pp
Then on the return I was able to book from Ravenna to Tronchetto for $58pp since we're staying in Venice a couple nights before returning to the US.
So in total we paid $206 US for 2 of us. I booked through RC Transfers 1-800-327-6700 and this charge was added to our RC Cruise invoice