The deals code I live by is anything that’s on sale for less than 20 percent off isn’t a good deal. But for something to be a truly great deal, it has got to be 50 percent off. It’s a discount you don’t see too often,

Today marks the final day of the Amazon Big Spring Sale. And if you haven't stocked up on all the best spring deals yet, now is your last chance. For instance, Amazon's best-selling smart home devices happen to be sporting major discounts as we speak.

In its press release, on its homepage, and on its landing page for the event, Amazon has advertised Big Spring Sale discounts of up to 40% — not too shabby. However, Mashable shopping experts have been combing the sale since it started Tuesday, and we've spotted a few dozen products that are at least 50% off.