Prodiamine pre e- works, and a 65 dollar bottle will last you forever- I also add it to my round-up for when I am spraying cracks in the concrete and rock beds. I use a heavy dose and it prevents weeds from returning.
Simazine pre=e- Cheap as well. a 2.5 gallon jug will last forever. I use in combination and I alternate with Prodiamine.
Gallery- Isoxaben pre-e. I use this in the summer for my yard since spurge and other weeds like to pop up. Not anymore since I started doing 1 app per year in late spring/early summer.
Certainty and Celsius... is money I also use Dismiss. Dismiss can be had cheaper if you buy the generic.
Certainty can be had for cheaper in the marketplace here sometimes.
Certainty is 100 bucks for 1.5 oz. A 20oz bottle can be had for 330 bucks of generic with the same AI, so people buy that and split.
Certainty is also good for poa annua.
It's always good to search for the Active ingredient, sometimes you can find a much cheaper product that is essentially the same.