Tickets for the 2012 Olympics are hard to come by in Britain. If you find any on the Internet then it is likely that you will pay well over the odds for them.
However, here in Spain, things are different because the Spanish Olympic Committee decided to sell its allocation of tickets through 20 Fnac music and book stores. Even though they have been on sale since December, very few have sold and so tickets for premium events are still available.
I suppose the nearest Fnac shop to here is in Barcelona.