I like to use Mirage. It's about 1/3 the price of Round Up and has the exact same active ingredients. I pay about $30 per gallon and buy in the 2.5 gallon container. Please note this is compared to Original Round Up not the Weather Master or Ultra which is even more expensive. I mix at about the rate of 2oz per gallon of water plus a sufficant at about 6oz per 15 gallons. This will cover about one acre at 4 MPH on an ATV with a boom sprayer. Hope this helps you out. Kills everything we have here in western NY. Can't ask for much better in my opinion. TGK