It will be well worth checking your email inbox this weekend, to see if there is an Argos Voucher in there.
It appears account specific, but if you are lucky you may find a decent money off voucher in your account.
A decent voucher at that giving you £7 off a £75 spend at Argos.
You will find your 12 characther code in the email.
It lasts until 9th February so there is a bit of time before need to spend it.
Just enter your items in the basket, and then enter it into the gift cards section in the checkout where the money off will be applied.