Below are some good choices to consider to get started on the right foot. If you want to go the DIY route, get the complete Rain Reserve kit and acquire your own barrel locally.
Sun and Earth located in Conshohocken typically has a few barrels available each week for customers of their environmentally friendly products.(So long as they are using them for rain collection or other ecologically responsible projects.)
Sun and Earth, Inc.
221 King Manor Drive
King of Prussia, PA 19406
Of if you don't live in the area: You can find a local source of barrels here It is very likely that you will not need to hook up your regular hose the entire year!