As i understand it you can buy one park hopper at the price of 88 dollars and it extends when you get to the park to three day park hopper. At leas that how my family and I just purchased our tickets. They expire on 9/30/09 i believe.
Once again this is all based on how my family and I bought our tickets for our trip on July 23rd.
"I love Mickey Mouse more than any woman I have ever known."-Walt Disney