安物買いの銭失い (やすものがいのぜにうしない): you get what you pay for; wasting money on a cheap item

you get what you pay for; wasting money on a cheap item

The cheap purchase that breaks and has to be bought a second time. Reach for it when talking someone out of the bargain option, or when admitting you took it yourself.

A Japanese proverb (ことわざ)