Cex

Cex don’t do discount codes unfortunately 

Sometimes vouchers appear on Cardyard.co.uk at 10% off

Thanks andy just checked nothing. Thanks

Have a look on avforums, sometimes there are CEX credit vouchers being sold

Buy cex vouchers on ebay, usually sell for around 85-90% of their value

There's some also some very reputable Cex buy/sell retro gaming groups on Facebook where vouchers are regularly traded for between 10%- 20% below voucher value.