I have four of these: they stack with each other. $5 each

http://www.totallyfurniture.com/linon-1780nat-04-as.html

Bendwood Stacking Natural Stool - Linon 1780NAT-04-AS
The Bentwood Stacking Natural Stools are perfect for any area of your home. The simple yet sturdy design will provide extra seating for a kitchen, dining or living space. The stackable function allows for easy storage to save space when not in use. The natural finish allows this stool to blend into virtually any decor.

1780NAT-04-AS Features:
Natural Finish
Versatile design can be used as stool, night stand, plant stand, or side table
Simple design that is perfect for any style space.
Stacks for easy storage