I can see your link does not display anymore what it used to. But anyways Musi, go to a wine or beer making store and it won't cost you a fortune (4.95$ for glass gallon and few bucks for what goes on top).
Besides, they are reusable in case you get hooked on making your own brews in the future. What is done with vervaine can be done with other herbs too. I found mine to be more potent than the one I used to make with vodka.