Monsanto, after selling the brand-name RODEO to Dow Agrosciences 2 yrs ago, introduced AQUAMASTER - a 53.8% glyphosate formulation - which costs approx $180 per 2.5 gal.
Cerexagri has also been marketing AQUANEAT, another 53.8% glyphosate product, in 1-gal jugs. Cost runs about $75/gal.
With all previously mentioned products, it is imperative that a surfactant (wetting agent) be tank-mixed with the herbicide for maximum plant activity.