I get mine from local farm and fleet and its called pronto big-n-tuff and I believe it runs $29.95 a gallon. Scoot
Most generic glyphosates are running in the $20/gal range for 41% glyphosate with surfactants. I helped bring generic roundup into the US, and i'm amazed how things have changed over the years. Also watch out for some of the chinese product that is out there at times. Many of the products out there actually now include monsanto tech product.
Basically the same product Monsanto puts in their name brand product. Sort of like when you go to the grocery store and buy a generic that might have came out of the same spicket as the name brand, but one pays less for the generic. The difference is marketing money, advertisement etc etc..