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call around, I get LR at my lfs for 3.99, rubble for 2.99. If you're in a metro area and have several in the area you might find a deal. Try Craigslist or a local reef club. Shipping a drag because your paying for live rock and then you end up needing to re-cure anyway
Also check out LiveAquaria.com, Blue Zoo Aquatics for their Bima LR, and some other online retailers. You will need to cure it if it's shipped as there is enough die off in the shipping process to start a cycle.