I think it would be nice to have raised beds tall enough to not need to bend over constantly. For building them, I'm thinking about cinder blocks, since they're pretty cheap. Has anyone here done waist-high cinder block raised beds? Did you need to mortar the blocks together, or did you use something else to stabilize them, or did they just stay?
Alternatively, what have you used to make cheap raised beds nice and high up? I don't see a super huge benefit to raised beds that are only raised 8 inches off the ground!