If you are cooking for non-commercial applications you can purchase pretty much any sous vide off Amazon and it will do the deed. Some of them offer more functionality and some less... but if it can get that water hot, that's all you need.
You will need a container, again, for non-commercial applications you can get away with using a pot, the sink or buying something off amazon.
Last but not least, you will need a vacuum sealer. You can get away by using Ziploc bags, but it isn't the same. Do invest in a decent thermometer.
You can be up and running at home for less than $200.
If you are using sous vide for commercial applications you will need to spend quite a bit more money, perhaps 5 times that. Commercial Sous vide machines (the good ones) start out at roughly $400.