I got started with spacebuckets. It's a community in Reddit, but also there's a website with lots of tutorials on how to build the enclosure that fits your needs with the materials locally available (I opted for Euro boxes).
It's not an already made kit, you would have to build it yourself, but it's pretty simple.
Also a lot of tutorials have things like Arduino controllers to check the pH and whatnot. Mine just has a lamp, a fan and a timer. You don't really need any of the fancy stuff, but you can add it later.