hay cubes and blue cloud/pumice rocks

I would like to find somewhere that sells Timothy hay cubes in larger amounts. I currently get them at Anderson's in the pet section and get like 15? or so cubes for $7. My two new boys love to tear these apart so I was thinking of getting them more often, but I'd like a cheaper option. I've seen alfalfa cubes more places, but not timothy hay ones. Any ideas?

Also I'm looking at getting some blue cloud/pumice/lava rocks. Previously have had the lava ledges and triangles for the pet store and my three love them. One only nibbles a bit, he's a wood lover, but again, my two new boys like destroying stuff so I'm interested in getting some of that. I think I've seen two vendors out toward AZ/CA but was wondering if anyone closer to MI sold them. I have to look around for the best price including shipping- and the worst price to convince my guy I got a good deal. He likes good deals (hes looking at getting a Sam's club card when we already have a Cosco's) and I can spend more on the chins that he would normally want us to that way. Shhh, dont tell him that I figured him out.

Also if you've got this stuff or anything else the chins may like and want to trade for wood, let me know and check out the wood Ive got for sale (grapevine, poplar, apple, pear, and blackberry)