Topcashback is the best recommendation I've ever had. OK not every single merchant is on that I buy from & not every single one has a discount but I've still managed to rack up over £200 in just over a year of using Topcashback & have cashed part of it in to treat myself to something I wouldn't have been able to justify using my 'real' money on. If you buy over the internet regularly excluding Amazon & Ebay then you should use Topcashback & just see your pot grow over time. It's free so you have nothing to lose & everything to gain.
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