http://www.tractorsupply.com//Produ...p_category=&parent_category_rn=&storeId=10151 TSC: $50 for 2.5 gallons at 41% Roundup: $110 for 1 gallon at 50% hmmmm. just picked up some of the TSC grade stuff. I had a coupon. Anyone have anything to say about this? Good, Bad or ugly? Also, at what concentration do you think would be good to kill stuff non-selectively?