For A Limited Time Only

I love deals that have attached, in fine print, for a limited time only. I mean it like they are drug dealers giving something away in the hope for future sales. The truly great thing about these deals is that you get something far cheaper than it would be normally. Another awesome thing is that these deals modify the chances of people actually buying these products. The only problem is if you really like the product and it doesn’t do well so they don’t offer it anymore, that always bite’s. So, I pose this question was there ever a product that you really liked that was discontinued?