All the camping sites at Lake Garda in Italy were full. We managed to get a tiny spot for our tiny tent for 40 euros a night when the manager of one of the sites saw us bumbling around. Ended up staying for two nights since the spot was actually pretty awesome. We were 30m from the lake shore, temperatures were in the 30C region and we just had a straight up beach vacation then and there.
The thing I like about paying campsites is the ability to wash clothes and take a shower. Both do wonders for my skin which has a tendency to not appreciate cycling