These herbicides include the active ingredient sethoxydim (Grass Getter), fluazifop (Fusilade, Ornamec, and Grass-B-Gon), or clethodim (Envoy). Fusilade and Envoy are only available for sale to licensed pesticide applicators, the others are sold in most retail garden outlets. This is not a complete list of all retail products; look for similar herbicides with the same active ingredient.
Update (looking for your input to improve the attack plan): I've completely cut my front yard out, a couple inches of dirt included. Rearranged my sprinklers so the flower beds are less likely to be watered other than from the drip system. Now, I know my dominant beast is not Crabgrass cause I can clearly see the rhizomes from Bermuda. Cum Spring next year, when there's foliage, I plan to use a non-selective weed killer like Roundup and continue to do so through Summer. Then, when the intense heat is past in Fall, I plan to mix a couple inches of mushroom compost into the top soil so as to give the then sowed Class Act 2 Tall Fescue Grass Seed a better leading edge on taking hold and thickening before the weeds start growing in Spring the following year.