Our local dealer has Roundup, SBK and Glyphosate. Price per litre (rounded up) Roundup = £50, Glyphosate = £16, SBK = £13. I was debating about Glyphosate and SBK when he pointed out the price of Roundup. I said it was B***** ridiculous, he thought so as well. I could buy 3 litres of Glyphosate and still have change from five tenners, while for 3 pounds more I could have 4 Litres of SBK.