You can order a lot of stuff online. But, E&F is going to have larger components, like the tray and stand. With DWC, you can use something as simple as a 5-gallon bucket. You might have better luck finding equipment for dwc.
Even if you're not much of a diy'r, making your own "bubbling bucket" is so cheap and easy. There are lots of vids on it, but this is the one I always mention: