Samsung sells a lot of stuff, and it sells it directly on its own web store. While the best deals are often to be found at retailers like Amazon and Best Buy, this week Samsung is keeping the savings for itself. The “Discover Samsung Summer Sale” is offering deep discounts on pretty much everything the company makes through Memorial Day, but we’re particularly interested in laptops and monitors here at PCWorld. For laptops, Samsung is offering big cuts on the Galaxy Book4 series, which we’ve long loved. You can get the standard 15.6-inch laptop model for as little as $650, with a Core 7 120U p…