^^^This. Have tried 2-4D and various "salt" formulas over the years, glyphosate is most effective, economical and contrary to psycho cali commies, safe if used correctly(dont eat it or bath in it).
And as Ray said, farm stores for the 2 1/2 gallon jugs or local co-op for larger quantities.
RM43 brand has another chemical that acts as a binder to the soil and extends effective time.
Roundup jugs from HD for use in your yard in town.
Watch out for wind drift, only takes a little to wreck your lawn or garden.
If you're unarmed, you are a victim.