OK bit of a weird one but do bear with me.
Currently you get a free £10 or £5 gift card depending on your purchase at Argos. Problem is this expires on December 15th so you could forget about it and miss out altogether or you may want to wait to spend it in the sales.
There is a way to get the card to be valid for 3 years all for the cost of a carrier bag.
You need to purchase your goods at the checkout and collect your gift card. When your item is ready for collection ask for a carrier bag from the member of staff but explain you have no cash and ask them to take the 5p from your gift card. When they do this the gift card is debited 5p but importantly revalidated and the expiry date changes to 2019.
Really not sure if this is helpful to anyone but I know I will forget about my £10 and it will probably expire at least this buys me a little more time.