Tickets for Alt-Thera and Akrotiri

Dear all,

I am planning to visit Alt-Thera as well as the Akrotiri archelogical site. As far as I know I need a ticket, but despite using Google I have difficulties to find the official way to buy it.

As far as I can tell, this seems to be the official website: http://odysseus.culture.gr/h/3/eh355.jsp?obj\_id=2454. Is this true? However, the website only tells a price, but there is option to buy it. Also, the website looks as if it has not been updated for at least 15 years and I don't know how accurate the information is. I found a few third-party website that sell tickets, but due to bad experiences with third parties I prefer to buy it directly from the service procider.

I am thankful for any help.