I no longer have the patience for this but a few years ago, shortly before Xmas, I noticed that sex and the city box sets were selling for £80 on eBay but a large store nearby had them on offer for £40. I bought 5 or so, listed them and they sold very quickly. I made several trips back to the store, buying ten at a time and reselling. I told the staff at the store that they were xmas presents and they thought that I had a massive family!!