I bought mine on Amazon.com. There are different sizes that will fit what you want to grow. There are soooo many grow kits. You can grow several different types of herbs (which I started in my Aero and later potted), lettuce, different tomatoes, flowers (which I am growing now) strawberries etc...
This thing is the greatest!!
Let me know by mail if you decide to buy one and I will point you to a discussion board that will answer all your questions.
Thank you! You have FReepmail!