After a long search, I have finally found a source for my grow bed medium. There is a place near my school that sells stone, so I decided to check if they had any gravel. Luckily, they have lava rock (my preferred medium of choice after Hydroton) and it is the cheapest of all their types of gravel.
The only problem now is transporting it. They sell it in a 1/3 yard bag (about 60 pounds) and we have no means to get it home. We might try breaking it up in a couple of smaller containers and making several trips, but at least I finally found my medium and it's relatively inexpensive!
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