The Tastecard offers great discounts on food at a large number of restaurants, in the form of either 50% off or two-for-one meals. I had a free trial last year that lasted for 3 months, and got a fair bit of use out of it, saving lots of money.
Since then I've had lots of spam about getting a tastecard (usually on a time-limited offer that just happens to be repeated every month) but today was offered another free trial.
Be warned, they probably will try to sell you a tastecard once the trial ends - you can expect an email every week or so. That said, the card does offer great savings, so I think it's worth it.