tickets to the last supper

Mary, Sorry, you're too late, it's over. Besides, it was by invitation only!

Mary, Although I knew what you meant, the phrasing of your question grabbed my attention. I couldn't resist posting my previous reply. If you enter "Last Supper tickets" in the search box in the upper right corner of this page, you will get a number of links to posts about your question on this site. According to one of those, the official site is: www.cenacolovinciano.net

Oh no, Robert! and I just finished ironing the linen table cloth and polishing the silverware! Mary, on page 299 of Rick's Italy 2011 book, he notes that you'll have a greater selection of days and time slots if you phone: 011.39.02.9280.0360, dial 2 for an English speaking operator. Pay with cc upon booking.
I made our reservations for 2009 2 months in advance and for the day we needed, there was only one time slot left...the last one of the day!

I agree with Darcy, calling is best. I made our reservations for May the morning they went on sale in February. I went online at 4amEST and nothing was available for the date we'd be in Milan! However, I called and was able to get a reservations. The only available time left was for the guided English tour, but I'd rather pay the extra 3-4 euros per person than have to buy them from a 3rd party. Go to the website that Robert posted and see when tickets go on sale for the month you're going. From my experience, I recommend calling early that day, especially if you're going May-September :)