Hi Tyler,
I went to get some barricade recently (perhaps it was another alternative in a 500ml bottle) but it was out of stock everywhere. So I used Oxafert - covers about 100m2 and is a pre emergent and fertiliser. Used it last season and it was quite effective, so happily used it again. I will reapply in another 4-5 weeks. Only $30, so cheaper up front, but not over the long run.
Cheers,
John