grimaldi-lines.com has timetables for sailings from Barcelona to Porto Torres in Sardinia.
on gnv.it (gnv is also part of grimaldi group) are sailings Barcelona-Genova and from Genova to various ports in Sardinia.
vrbo.com, interhome.com and holiday-rentals.co.uk are all rentals websites which I've booked through. Check what they have in Sardinia.
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