Hydroponics Stores

Where can I buy Hydroton in Kansas?
I live in western Kansas (out near Hays), and I would rather not pay some online place as much as to ship Hydroton 50L bags to me as I pay to buy them in the first place. I realize that growing medium isn’t light, so I was hoping to find a place, even if it’s several hundreds miles away, at which I could buy Hydroton in bulk. I’ve spent the last two hours searching Google (and mostly finding only thinly disguised link farms). Does anyone know of a Hydroponics supply store in western Kansas (or in Kansas at all)?
PS: I can’t use growth medium made from coconut fibers (like the suggested bricks) because it’s not suitable for Aquaponics. Coconut fiber not only biodegrades over time (which would destroy the biological filtration process the medium provides), but it also leeches into the water, discoloring it and changing the pH. Hydroton (i.e. Expanded clay) is both inert and won’t degrade, two of the primary requirements for Aquaponic growth medium.
Check out Spray-N-Grow Gro-Bric – One small brick becomes 2 ½ gallons of growing medium
Hydroponics Store Virtual Tour. Grow Maxx