I don't want to depress the Valentine candy market, but definitely the day to buy candy is tomorrow, when it's around 50-60% off.
I went to the store one year the day after Valentine's Day and got so much candy for 10 bucks, I still haven't come down from the sugar high. Big heart boxes full of sampler chocolates. It was so much chocolate I wasn't even nibbling the chocolate off the jelly ones before tossing them out.
Every holiday is a total letdown when it's over, that's well known. And Valentine's Day is no different. But it's much different than, say, Christmas, in that there's virtually no build up to it. And when it's over it's over. But with Christmas you go shop for bargains for the next year. With Valentine's Day there's no saving up for next year. You just pig out on the candy for a week and that's it.
And there's some other differences. With Christmas, usually your gifts last a while. But what about Valentine's Day. Candy, we've covered that; it's eaten. Flowers, they quickly rot. Stuffed animals, I don't know what happens to them, but they're useless. You spend way too much for flowers, flowery cards, going out to eat, and it's over.
Have a great one!