This is what should happen. You signup for Hukkster, add a little button it gives you for your web browser, and then tap that button any time you’re shopping online and see something you fancy. It should go into a little list that Hukkster monitors for you and come the day that your item goes on sale, you’re notified.
I’m sure that is what happens in reality too, if you’re in the US. Here in the UK it doesn’t seem to work but the company says there it works on “select international sites” outside America. Nothing seems to happen when I try it on Amazon UK, though.
Take a look at it if you tend to buy a lot of items online. I’m not entirely sure I remember when I used to buy things in shops, but.