Instructions:Just spotted this on the quidco blog - and I know YesAsia is a popular site for some game buyers. The discount code gives you $5 USD/£2.80 GBP off any purchase over $30 USD - for NEW accounts. I'm sure it will be useful to some!
You don't have to worry about VAT on imports as YesAsia covers those. They also offer a massive 10% quidco cashback on sales, with 7% cashback on games and electronics.