Me and my mates have toured europe 3 times and always use the Eurocamp campsites. They will send you a map of europe with the campsites locations on it. First year we pre-booked all the sites, but now we just turn up and negotiate a price at each site. If you know your next location, the reps will phone ahead and make a booking for you. Great campsites in great locations and the reps can give you info of local attractions. Last time we went to Luz st Sauvier in the French Pyrenees. Averaged out at about £12 each per night over 16 nights. Dont go July or August as they dont like groups then. they are family campsites.