If you need to buy stamps, buy commemorative ones.
Which is to say, if you walk into a post office and ask for stamps they will automatically give you this:
When, if you ask, for the same price per stamp you can get one of whatever interesting stamps they're doing at the moment.
Featuring such nerdy and delightful tiny pictures of
Cool old/cultural stuff like CASTLES
Movies and TV shows such as LORD OF THE RINGS, complete with a feature that's only visible under UV light:
Quite often, NATURE STUFF (landscapes, flowers, plants, animals, space, etc.)
Whatever they've got, I GUARANTEE it is more interesting than whatever boring stamp everyone else is putting on their envelopes. And the price is the same. Why would you not do that??
If you are in a post office to buy stamps [which is totally normal for anyone born after 1980, shush] just be like, "do you have any interesting stamps in at the moment?" Sorry, I know it feels weird to do that but they will know what you mean.
If you don't ever go to the post office or you feel self-conscious, check if your postal service has an online shop and buy cool stamps from there. A nice bonus of getting them that way is, they do still cost the same and the shipping is usually free because they are the postal service.
It is always delightful to get something nice through the post from someone you know and care about, right? You can just do that for someone else anytime, and it's totally legal and super cheap. You can make a postcard out of a cereal box, put someone's address on it, stick a stamp on it, chuck it in a postbox - and they will be SO CHUFFED to get it.