I am being an utter skinflint ... 
We are travelling to Italy (flying to Rimini then driving to Perugia) with 2.5 yo DD at the beginning of May and I'm trying to sort out car hire. It seems that my options are either to rent a car for £100 then pay an extra £60 to hire a seat for a week or pay £130 then pay an extra £30 for the seat, and it just seems such a rip off (I'm also irritated that if you hire the cheaper car then they just double the cost of the car seat).
I am looking into a couple of companies which hire out baby equipment to see if any of them will deliver to Rimini airport, but it's looking a bit unlikely. We're flying with Ryanair, so taking our own seat would also cost about £60. The only other option I can think of is leaving DH and DD in the airport, popping to a hypermarket and buying a seat, then going back to pick them up, but I have no idea how feasible this is. Is it easy to buy seats in Italy? Are they expensive? Any advice much appreciated!