For something painfully expensive

Costar un ojo de la cara

kos-TAR oon OH-hoh deh lah KAH-rah — To cost an arm and a leg

"Ese hotel cuesta un ojo de la cara."
That hotel costs an arm and a leg.

Literally "to cost an eye from your face" — the Spanish version of the English idiom, just with a different body part.

"Basically anything in central Madrid these days, unfortunately."— Graciela