It's easy enough to cold brew at home, too. You can buy the Toddy system here, but I like to find ways to not acquire more kitchen appliances than I need to. For one, my kitchen is 5.5' by 6.5' and secondly, on principal, if I can do something with things I already own then that's how I'll do it.
The science is simple:
1 lb course ground coffee + 10 cups cold water
Soak over night, filter and voila, cold brew iced coffee. Here is the system I've got going.
Chemex (coffee snob) and I pour my coffee into it and through a muslin filter (I made this to save from having to trash paper filters all of the time). You'd be surprised how much liquid sticks to the grinds so the longer you have to sit and let it it filter out the more coffee you'll get in return.