Not sure what your plans are for your setup, but generally don't need that much rock. Porous, airy Australian live rock, even at 5 lbs is plenty.
But if you plan to use all LR it will be pricey. Maybe Eric can work something out for large order. It's uncommon to encouter premium Indo Pacific LR today at less than $30 per lb, unless its a tank break down or seller looking to move remaining inventory.
One approach is while curing Australian LR you can also place dry rocks in the same holding bin. Basically cure and season the dry rocks and allow their biome to stabilize with the LR. Letting the 'uglies' play itself out.
When well taken care of and not neglected this premium LR can be used to innoculate and seed dry rock with every new system setup.