I thought I post this because a lot of people renew their AMC membership today. If you're a new member, I highly recommend getting an annual popcorn bucket for $20.99. Today you get free refill (normally $4.49).
I like this deal a lot because if you go to theater and order the gourmet popcorn (caramel or cheddar cheese), the refill is $4.49 and that's actually pretty decent price for caramel popcorn. The bucket is regularly $8.69. You save $4.20 each trip and you will recoup your cost of bucket in just 5 trips (20.99 / 4.20)
For the people who renewed today, you might be able to get a refill for free as well. I showed the store clerk and I got a free bucket of caramel popcorn. But YMMV for renewals.