Josh, I got mine from ADG because I couldn't fine one as wide and short as the glass cylinder 3005 they sell (I think that's what it was) and it was $30 IIRC.
You can find other vases at places like Michaels, Hobby Lobby, Ikea, Ebay, etc. Look in the floral department. I have seen smaller cubes and cylinders that are pretty much the same as the ADA ones but only cost $5-$10!
I am waiting on a ball of aquasoil powder to freeze in the freezer before I finish up. I am freezing it to make it solid and easier to work with white I wrap it up.
I had to boil the grass four times before the water was clear enough for me to use the grass. The boiling didn't degrade the grass, and the grass strands are about a foot to a foot and a half long so it should be easier to use than coir.
Here is the grass before boiling:
Water after the first boil: I had to do this four times until most of the tannins were out.
Grass after the boil: soft and pliable!
Moss I collected from the back yard. I expect the submerged moss to die and the emersed moss to live. If it dies anyway I will just plant HC or Glosso or something over it. I would have used aquatic moss if I had this much lying around.
I stole ten granite rocks from the neighbors driveway and put them in the center of the grass, which I patted down to compress it in this container. It's a ten or eleven inch container.
1/2 cup of aquasoil in some of my mom's pantyhose. I'm going to freeze it solid then remove the pantyhose to make it easier to work with while I wrap up the ball. I'll place it over the rocks. I don't know if the aquasoil will "leak" silt through the grass and moss to dirty the water. Hope not, but I have a feeling it will. If I try not to water from the top or move the ball it might be OK.
I'm trying to keep with the philosophy of wabi-kusa and use natural things like grass and moss instead of plastic pot scrubbers or rock wool. Nothing wrong with that, though, and should work great too!