This is the 3129th most frequent Spanish word.
sale
"Sale" in Spanish means "he/she/it leaves" or "he/she/it goes out," and can also mean "OK" or "fine" informally, depending on context.
In this context, 'sale' comes from the verb 'salir' and is conjugated in the third person singular form in the present tense, meaning 'leaves' or 'goes out'.
Ella sale de casa temprano para ir al trabajo.
She leaves the house early to go to work.
Here, 'sale' refers to something resulting or happening, specifically that the third item costs nothing in this situation.
Si compras dos, el tercero te sale gratis.
If you buy two, the third one comes out free.
In this case, 'sale', derived from 'salir', means 'appears' when used to describe being shown or broadcast.