The value of a fine education cannot be measured in monetary terms.
Literal
Excellent education [possessive-の] value [topic-は] money [with-では] cannot-measure.
はかれない is the potential negative of 計る ('to measure'). では combines the manner で ('by means of') and contrastive は — 'by money at least, it cannot be measured.' 金銭 (きんせん) is a formal synonym for お金.