Penny wise pound foolish
akiba haifaɲi taɟiri
In Swahili Akiba haifanyi tajiri
This Swahili proverb, while not a direct translation, conveys a similar idea about the importance of making wise financial decisions.
Example
"Alinunua bidhaa za bei rahisi, sasa anatumia pesa nyingi kwa matengenezo. Akiba haifanyi tajiri."