money does not grow on trees

/mˈʌnɪ dʌznˌɒt ɡɹˈəʊ ˌɒn tɹˈiːz/

/mˈʌni dʌznˌɑːt ɡɹˈoʊ ˌɑːn tɹˈiːz/

used to imply that money is not easily obtained or available, and one should not waste it unnecessarily