A local stone supplier is your best resource for slabs of granite/marble. Extra/scrap pieces can often be purchased inexpensively. Shipping of fabricated stone is prohibitively expensive.
Just a 2 ft square slab of 3/4" granite, with plain corners, cost me about $200 each from a local stone shop. Shipping costs, if not local, can be prohibitive. There's a custom door place up here where some of the guys do projects in their own time.
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