It is well worth signing up to get offers in your inbox from Argos. I have recently received a £5 voucher off of my next order with no minimum spend, just for having signed up for a year.
At Christmas I also received 3 x £10 vouchers as a present, also with no minimum spend. I also get all the best deals straight away.
To sign up just go to their page, scroll to the bottom to a bit called ‘Get our offers in your inbox’ and put in your email address.