Need advise for amazon

hi there,
i would like to know how much does a 1 yr old yellow naped amazon parrot cost? i got a offer for S$700. Its abt less than a yr.The bird looks healthy n tamed n has a ring tag but does not say a thing,(no talking or screaming) but only scream abit when trying to touch it.
Is it a goood offer,what else do i need to look out for? pls advise.hope to hear from u people.
thnk u

regrds