As part of its Prime Big Deals Day event, Amazon is offering the EGO Power+ 56V 21-inch Cordless Self-Propelled Lawn Mower with a 7.5Ah battery for $529.99 shipped. At full price, you’re looking at a cost of $649 normally, with occasional falls to $549 spaced out over months on average. We did see it fall to a $454 low back in March, with other discounts peppering the spring and early summer until keeping mostly to its MSRP from the top of June. Today we’re finally seeing a price shift once again, as $119 is slashed off the tag to give you the second-lowest Amazon price we have seen – $76 above spring’s low.