They’re custom stickers from StickerMule, which is not quite a nice company, but they have some deals they almost surely loose money on.
I’ve put these together:

Yes, that includes worldwide shipping. Each of those can be ordered just once, but somewhere I heard a legend they don’t check for duplicate accounts, but I haven’t tried that myself.
There’s also a $1 Unixstickers pro pack (account not required)

Edit!!:

After 2 such orders they almost charged me EUR 18 on that $1.25 for 10, even though the checkout page did say $1.25 when paying. So choose the option with proof if given option to skip it. (It will let you cancel before approving the proof.)

Edit 2: I see the problem. If choosing different currency (EUR in my case) the deal price will be converted correctly in checkout page, but not be valid. So just pay in the default currency (USD).

Stickers rule

Stickers rule

Edit!!:

After 2 such orders they almost charged me EUR 18 on that $1.25 for 10, even though the checkout page did say $1.25 when paying. So choose the option with proof if given option to skip it. (It will let you cancel before approving the proof.)

Edit 2: I see the problem. If choosing different currency (EUR in my case) the deal price will be converted correctly in checkout page, but not be valid. So just pay in the default currency (USD).