Stackable Washers
A stackable washer is a front load model built to carry a matching dryer on top with a stacking kit, so a full laundry pair fits in a closet or a corner with the footprint of one machine. Both full-size 27-inch pairs and compact 24-inch pairs stack. Before you buy, measure the closet height, width and depth with room for the doors and the hookups behind them, confirm which stacking kit fits the pair (it is often sold separately), and check that the dryer's venting suits the space. The stackable washer and dryer guide linked here walks through the measurements.
All Make Appliance lists 53 stackable washers from 10 brands, including Electrolux, GE, LG and Maytag. 32 of them are in stock right now, and every listing below shows its current availability. Free NJ/NY-metro delivery on orders over $499.

5.0 cu. ft. Smart Front Load ENERGY STAR® Certified Washer with FreshFlow™ Vent System and Intelligent Wash

2.4 Cu. Ft. Smart Wi-fi Enabled Compact Front Load Washer With Built-in Intelligence
Model: WM1455HWA
4.5 Cu. Ft. Ultra Large Capacity Front Load Washer - Black Steel
Model: WM4000HBA
4.5 Cu. Ft. Ultra Large Capacity Front Load Washer - White
Model: WM4000HWA
5.0 Cu. Ft. Mega Capacity Smart Front Load Washer With Turbowash® 360°, Ai Sensing And Hybrid Electronic Controls With Lcd Display
Model: WM5800HAA
5.0 Cu. Ft. Mega Capacity Smart Front Load Energy Star Washer With Turbowash® 360° And Ai Dd® Built-in Intelligence
Model: WM6500HBA
5.0 Cu. Ft. Mega Capacity Smart Front Load Energy Star Washer With Turbowash® 360° And Ai Dd® Built-in Intelligence
Model: WM6500HWA
5.0 Cu. Ft. Mega Capacity Smart Front Load Washer With Ai Dd® 2.0 Built-in Intelligence & Turbowash® 360°
Model: WM6700HBA
4.5 cu. ft. Front Load ENERGY STAR® Washer with Tumble Fresh Option

4.3 cu. ft. Closet-Depth Front Load Washer with Intuitive Controls

4.5 cu. ft. Smart Front Load ENERGY STAR® Washer with FreshFlow™ Vent System

4.5 cu. ft. Smart Front Load ENERGY STAR® Washer with FreshFlow™ Vent System

5.3 cu. ft. Capacity Smart Front Load Washer with UltraFresh Vent System+ with OdorBlock
Model: PFW870SPVRS
Smart Pet Pro Front Load Washer - 5.0 CU. FT.

Smart Pet Pro Front Load Washer - 5.0 CU. FT.

Front Load Washer with Extra Power and 12-Hr Fresh Spin™ option - 4.5 cu. ft.

24" 2.4 Cu. Ft. Front Load Washer with Steam

4.8 cu. ft. Capacity Smart Front Load Washer with UltraFresh Vent System with OdorBlock and Sanitize w/Oxi

5.0 cu. ft. Capacity Smart Front Load Steam Washer with SmartDispense UltraFresh Vent System with OdorBlock and Steam

5.0 cu. ft. Capacity Smart Front Load Steam Washer with SmartDispense UltraFresh Vent System with OdorBlock and Steam

300 Series Front Load Washer - 4.4 Cu. Ft.
Model: ELFW7337AW
400 Series Front Load Washer - 4.5 Cu. Ft.
Model: ELFW7437AT
400 Series Front Load Washer - 4.5 Cu. Ft.
Model: ELFW7437AW