Need juuuuuuuuust a little more info here, buddy. Are you looking for a non-selective "RoundUp", or are you looking for a selective like Atrazine, 2,4-D, or what?
For RoundUp, go to your local farm/ranch supply store. Buy a 2.5 gallon jug of Glyphosate 41, it costs $60.
STOP TYPING WITH ALL CAPS, IT SOUNDS LIKE YOU'RE ANGRY!!!