You can tell this self-emptying robot vacuum when and where you want it to clean — and Amazon has it marked down to $330, from $599, only if you shop now.

Amazon Prime Big Deal Days are mega-event sales during which Amazon slashes prices on tens of thousands of popular items. The sale lasts for just two days. Inventory on many products that go on sale is limited, so if you want to get the best deals, shop early to snag the items you want at a deep discount.

Amazon said on Tuesday that it will host its Prime Day-like sales event, "Prime Big Deal Days," on October 8 and 9. Amazon will hold Big Deal Days in Japan later in October. It has also prepared a holiday gift guide.