Big W slashes Dyson price in flash sale The department store has cut $250 off the cult vacuum cleaner during a 2-day flash sale that sees hundreds of other items temporarily reduced. Smarter Shopping 20th Apr 2021 11:54 AM Big W is selling a popular Dyson stick vacuum for just $449, $250 cheaper than its retail price, as part of a flash sale this week. The Dyson V7 Animal Origin Cordless Vacuum normally costs $699 but will be available for $449 from now until midnight on Wednesday. The deal is part of a two-day flash sale Big W is running on 750 items including tech, toys and kitchen appliances.