Hi, Rebecca. My family and I will take our first trip to Disney World this September. While researching, I found beautiful pictures of the welcome packages sold by Disney Florists. For me personally, I can't really justify the cost. I have planned to re-create the Mickey's Grand Welcome package. I found some very helpful pictures and ideas from the DisCreative board. I have everything all ready to go. It cost me wayyyyy less money, and I was able to personalize items more and include more items.
I think the Frozen in room celebration package would be a wonderful gift for your girls. If you think it's worth it, I say go for it! I bet they will be soooooo happy to be at Disney World that the in room celebration will be the icing on the cake