Thank you! Those concrete paving stones are the cheapest and easiest way I found to make raised beds. Home Depot, 98 cents to $1.29.
My favorite feature: I can move beds as fast as I can move furntiture. Just move the stones, and then shovel or hoe the soil to the new dimensions.
In in slug-breeding season, tip stones away from soil and spray the slugs and egg masses with ammonia.
Those are 8"x16" and 3/4" thick ... I use them "the long way" if I expect roots to be able to force their way into the underlying clay. I loosen it, amend it some, and am carefull to see that it has a drainage trench so it doesn't flood.
Where I have a very deep bed, e.g. a sunken walkway between two deep beds, I use them "the tall way", a 16" tall bed seems deep enough for almost anything.
However, the 12"x12" 1" thick paving stones are more stable and make a bed deep enough for most things. One auther suggested gluing or mortaring four of them together in a cube and filling it with soil mix for a one-cubic-foot planter (7.5 gallons). But put it where you want it before glueing it: it's too heavy to move even BEFORE you add soil!
