A penny spared is better than a florin gained.
More Dutch Proverbs:
If one won't another will.Dutch
When one sheep is over the dam, the rest follow.
Dutch
A daily guest is a great thief in the kitchen.
Dutch
It sticks to his fingers, like the charity-money to the matron.
Dutch
If thou touchest pitch thou shalt be defiled.
Dutch
A fool may chance to say a wise thing.
Dutch