When we went we got them when we booked the hotel.
At the moment I dont agree with what park operators are doing, having been informed by Disney its not them setting the ticket sale rules.
If you want to stay at the hotel for 2 nights you have to get tickets for 3 days even if you are only going to the park for 2 days! The only way you can avoid this is to stay off site. I was saying to them I could get an offer 2 days for the price of one, but I got told no and that I had to buy the tickets through them. I suppose my case could be a bit different as I booked using DVC.
If you want to get a package deal and are going to use Eurostar book via their site, its cheaper. I drove so had to book by calling Disney.
I dont know if anyone found another way of getting round this.
I have just looked at their website is fine, it could be your browser.