One way to combat this mentally is to have set prices for things in your head... ie the price you feel each commodity should cost. Don't buy things that deviate

One way to combat this mentally is to have set prices for things in your head... ie the price you feel each commodity should cost. Don't buy things that deviate to far from that price. For example I feel a nice non-iron, fitted, button down shirt shouldn't cost more than $20, so I only buy when I see them at, or around that price, BOGO or not (and I need one/two). Same goes for lightning cables, I'm not paying more than $5/(10ft)cable no matter what material it's wrapped in.