At Donau Camping Krems in Krems (Lower Austria) camping costs as little as €20,- per night during low season with CampingCard ACSI. At one of the 60 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).
Campsite right by the Danube. The old town of Krems and sightseeing boats are within walking distance. Cycle paths both sides of the Danube. Around 21st of June 'Sonnewende Fest' with amongst others fire works.