Take it or leave it!
Meanings
To accept or reject something unconditionally
Examples
This is my last offer: take it or leave it! 
Questa รจ la mia ultima offerta: prendere o lasciare!He told me that was the lowest price, take it or leave it
Mi ha detto che quello era l'ultimo prezzo, prendere o lasciareOrigin
It's an expression to indicate one's final offer and it's been in use since the mid-16th century