AmazonBasics Microfiber Cloth Packs
Not the most exciting products in the world, but definitely useful ones.
AmazonBasics Wooden Suit Hangers (30-Pack)
Outfit your closet with these durable, solid wood hangers instead of dealing with a hodgepodge of wire and/or plastic ones that don't handle the job as well.
AmazonBasics High-Density 36″ Round Foam Roller
With the proper technique, a foam roller like this one can help release muscle tightness after a workout, improve your flexibility, and/or relieve pain from sitting all day.
AmazonBasics 4-Piece Packing Cube Set
For about the same price as Eagle Creek's "Pack-It" Cubes, you get larger cubes in general and an extra one besides, but there are tradeoffs.