Rideshares/bassliner wednesday morning

Hi, I am looking for a ride from Berlin to Fusion on wednesday morning for me and 2 girlfriends. Is there a combo post here that I missed maybe? I booked a ride on blablacar.de for 12 euros and the person wrote me saying its actually 30 which is a bit annoying but common I think. I am Polish and will be travelling from Krakow with a stop in Berlin) Any tips where to look?