My own ideas on grit:
play sand (tends to be too fine and too smooth)
chicken grit, crushed oyster shell (expensive)
chicken grit, cherry stone (heavy)
coarse builder's sand (have not been able to find it, need to check Lowe's or Home Depot)
perlite (too light causes tendency to blow away in wind)
patio stone base (worked pretty well, but may be too limey for some plants)
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