At Relaxcamping Maltschacher Seewirt in Feldkirchen in Kärnten (Carinthia) camping costs as little as €20,- per night during low season with CampingCard ACSI. At one of the 40 touring pitches you will get a discounted rate during the period . At this campsite you can not only use your CampingCard ACSI for inexpensive camping, you can also use your ACSI Club ID (as an alternative ID).
Small, very well-maintained campsite right on Lake Maltschacher. A good restaurant with a lovely pavement cafe means you'll have a great camping holiday.