Collect various cards (birthday, anniversary, holiday) while you are out on your normal shopping trips. Keep your eyes peeled for discounts/sales (especially after holidays—you can plan ahead for next year!)
Organize your cards and “file” them away in a box along with a nice writing pen, cute stamps, and a calendar of birthdays, anniversaries, and other special events.
Here’s the KEY: Whenever you find yourself with a few spare moments, write out a card or two for upcoming events (i.e. your niece’s graduation that’s a couple months away), rather than waiting until the last minute.
Write the date of the event (i.e. 9/15) in the space where the stamp will go. A week or so before the event, place the stamp over the date and stick it in the mail!