"Bonide" also makes a concentrate (same "active" as the Fertilome, sethoxydim ), and there is also one called "Ornamec"....which has the same "active"(flurazifop-P-butyl) as "Grass-B-Gone".
The 'ready to use" sprays are usually found at home stores, or hardware stores, but, the concentrates will be at regular "nurseries", or "on line".
The Fertilome ( or, "HI-Yield"....same stuff, same company, different packaging
) is available, for me, at several 'local" nurseries / greenhouses. I did buy the Ornamec, on line, a few years ago, but only found it in 1 quart bottles (about $80), and, as is true for many "on line " things....shipping was high. If Amazon has the product you want, they *sometimes* have a 'free ship" offer going ( that might depend on how much you spend
, not sure
).