ἔστι δίκης ὀφθαλμός ὃς τά πανθ' ὁρᾶ → there is an eye of justice that sees everything, all-seeing justice
frugally: P. φειδωλῶς.
cheaply: P. εὐτελῶς (Xen.), μετ' εὐτελείας; see cheaply.