What’s the best and cheapest way for a transfer in Majorca in August from Palma airport to Cala Millor?

asked: We need a cheap but reliable transfer in Majorca from Palma airport to the resort of Cala Millor (in the East of Majorca, 68kms from the airport).
It doesn't matter if it's a taxi or a shared shuttle. The cheaper I've found is £22.50 per person with Resort Hoppa, and there are three of [...]