Cards - My mom was big on cards and I still enjoy sending them. My birthday is this week, so I have couple that already came up on display. This one from my sister-in-law is my favorite so far:
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Amazon packages - It's so convenient to just order what I need and have it the next day!
Care Packages - It was so special back when I was in college to see that little card in your post box saying you had something at the window.