Thanks for these tips!

I do have a question, maybe you can answer it. I'm sending a boxed package to another state (I live in Kentucky, and I'm sending to Pennsylvania). To ensure that it gets there in time for Christmas, what's the last possible date that I need to get it out? It'll be relatively small, but still a box of some sort. Just wondering if you knew how fast/slow the United States Postal Service was this season.

Thanks!