On Amazon you can pre-order movies, games and more. I have often ordered movies that I knew we were going to purchase. The benefit of pre-order is that the day the movie comes out, you will get it in your mail box from Amazon. Amazon will also pay you the difference back if at any time you pre-order and the price drops, between when you order and it ships. They send you the difference back.
Currently they have Rise of the Guardians on pre-order for $22.99, this is the Two-Disk combo Blu-Ray and DVD + Digital Copy + Ultra Violet + 2 Promotional Toys!!
If you have not seen this movie, I HIGHLY recommend it. I thought it was great! It might be a little intense for your littlest kids, but it was so entertaining for adults!
Go HERE to get yours!