There is a common base cost for any marina that belongs to Balearic Local Government
You can try to download information from their website. Google
Any other marina at Ibiza out of the ones mentioned is going to be very probably at a higher cost.
Generally you will find two ways of berthing: alongside and perpendicular to pier (mediterranean style) this last one is obviously cheaper.
I enclosed a screen
Punta: berthed mediterranean
Costat: berthed alongside
Transit: boats not based in the port
Resta del any: rest of the year
The cost is expresed in euro per square meter ocuppied. Basically lenght x beam
Best luck and regards