Hopefully this helps someone. 5.5% quidco http://www.quidco.com/ticketmaster/?
I just purchased some tickets for Ricky Gervais' new tour, Humanity, despite being told they were sold out everywhere! Not a discount on rrp, but considering these are on sale at second-hand ticket sale websites for four-times the price. Seems a steal to see him live if you like his humour.
Cardiff is really easy to get to on the train so not too bad even if you don't live around that area.
5.5% Quidco for the next 8 hours as well for anyone who uses it...