be penny-wise and pound-foolish
To be so concerned with saving money that one ignores larger problems and ultimately ends up spending more. I know you don't want to pay for this expensive course of treatment, but when ignoring your health lands you in the hospital, you'll see that you were penny-wise and pound-foolish. Don't be penny-wise and pound-foolish when it comes to home repairs. Saving a few bit of money now on shoddy work could cost you dearly down the line! Come on, Dad, just pay for a smartphone that actually works. Stop being penny-wise and pound-foolish.
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