That’s a good question. I mean. Probably Amazon. But what she actually ordered was this package of infant elasticy headbands. They are far more comfortable, and more forgiving than using actual elastic. She ordered a package of them. I don’t know how many there were, but it looked like a LOT. 30? 50? Unsure.
I’ll see if I can a link to them from her.
ETA: Here you go!
And here is a picture my wife provided showing how she cut it in half.
She said this: “Once I snip the head band, I cut it into two thinner pieces. After that I measure and cut the proper size (usually 18-20cm). I personally think the headband is a bit thick as is. Maybe fine for someone who doesn’t wear glasses. That’s why I cut it down the middle.”