see if you can find a landscape supply place near you, or some sort of stone/gravel seller. They will probably have lava rock, and sell it by the pound.
Not sure about lace rock, worth looking while you are there.
here is where i get my lace rock http://www.aquariumlacerock.com and I have heard that the best place to get lava rock in black and red is http://www.lavarock.biz contact them about bigger sizes for fish tanks they have it. I hope this helps you.
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