I bought pieces of my home brew setup from several vendors.
Midwest supplies is a great vendor. Recommended.
To start, you're going to need a few things, but the problem is (if you're like me) you'll always want more and more.
The kit you've posted has everything you need to get you started making beer, with the exception of maybe a large pot for doing the boil in. If you're doing extract kits, you can do the boil with maybe 3 gallons of water and then add top off water, but the best I've done has been with boiling the full wort at once. Turkey fryers make great beer brewing kettles, and don't let anyone scare you into not using aluminum to brew in.... it's fine.
If you go down this road, you're gonna have a lot of fun.....