I was really tickled when I saw this for sale on Vestiaire Collective today.
I thought it was a single button and had a giggle at selling a button for that price. But a second look showed it was a set of five buttons, which could really help someone out. I hope it was well-enough described to show up on a search.
I have always liked changing up old coats, shirts, and cardigans by switching out the buttons. Mass-produced fashion almost always has badly-attached cheap buttons which can look shoddy, or fall off/break. Changing them for vintage or higher quality ones can really change the feel of a garment. It also makes a huge difference if you do it with a piece of clothing you have grown tired of.
My favourite Zara parka suffered from broken buttons over time. I love it so much that I replaced the big black buttons with big green, red and yellow ones, because they were the only ones I could find that fit. I received so many compliments on my bright buttons, until I finally wore the parka out. I miss it even today!