Piglet, I did actually see both of those tickets! 105 is not to bad considering the other one going up to 175. For your third car I would just get a parking blue tickets for 18 euro's and walk the stuff over to MB, you will have plenty space for an extra tent. We have actually secured 12 passes for MB now, unfortunately we will need all of them because of our setup!
Maybe we still get another 5 trough the ACO, but I am not counting on it. If we do, we will post them here for face value first, but we might add GA tickets with those for a little bit more money than they cost at the gate, because we got them through a ticket agency and they are more expensive there.