As in you literally don't have to spend any money. At all. You're welcome.
Does your friend or family member like to cook? Bake? Mix drinks? If so, compile recipes you love, along with any treasured family recipes. Choose themes relating to his or her life and introduce each section of the cookbook with a little personalized note. If they went to school down South, include a Southern comfort food section. Do they love Roald Dahl? There's a whole trove of Roald Dahl-themed recipes waiting for you to find them.
Okay, so it doesn't have to be an actual mixtape (who has a cassette player anymore?), but creating a custom playlist is a sweet gesture, especially when you choose songs that are meaningful and relevant to your relationship. Burn the playlist to a CD—yes, an actual CD—and decorate the case rather than just file-sharing the music. It's nice to have something physical to unwrap.