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.
I'm not sure what dimensions you need but if there is a restuarant or cookware supply shop in your area check them out. They will usually have butcher block cutting boards and granite or marble slabs. These shops have various sizes and shapes in stock. Possibly could accomadate your requirements.
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