If you can watch a few YouTube vids, and have some basic tools, you can easily build your own for much less. You can also customize it to your needs. A much better system than 12 buckets is using 6 x 27-gallon HDX totes. They take up the same space as 2 buckets, but hold much more water. More water is much better than less. It helps keep your temps cool, pH balanced, helps prevent the need for flushing, etc...
Take a look at my grow thread. Many of the pros here use many of the same components/totes.
My thread