to cost an arm and a leg
Eu adoraria comprar uma Ferrari, mas elas custam os olhos da cara.
I'd love to buy a Ferrari, but they cost an arm and a leg.
The popular story credits the Spanish conquistador Diego de Almagro, who lost an eye storming an Inca fortress in the 16th century. Back in Spain, he is said to have told Emperor Charles I that defending the Crown had "cost him an eye from his face" — and so the eyes, among the body's most precious things, became the measure of a ruinous price.
Source: O Povo.
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