What can I sell on Amazon to break even?

Okay, here's the problem. My insurance company recently paid out for I claim I made. They issued me with �900 worth of Argos vouchers, so I could replace my laptop which had been stolen. Prior to receiving said vouchers I went out and bought a replacement laptop. Now I'm stuck with the vouchers. My insurance company won't issue a cheque as I stated I wanted vouchers from the outset (don't ask me why). I've sold a few items on amazon and I'm thinking the best way to recoup my money is to purchase something from Argos, and sell it on Amazon. I realise whatever I purchase will result in some kind of a loss. The question is, what item would result in the smallest loss?