Through 5/22, this Dyson Ball Compact Allergy Upright Vacuum drops from $519.97 to $288 at HomeDepot.com. Plus shipping is free. This is the only site we found offering this model at a discount (although it did drop to $250 earlier this week from another retailer). It can be used on multiple surfaces including carpet and hard floors, comes with two extra tools, and features ball technology which makes it easy to steer. Sales tax is charged in most states.