I had a friend who added an island in the kitchen with granite from the ReStore. Next to nothing in terms of cost.
When most people think of countertops, they imagine large slabs of stone. Because most stone showrooms insist that you buy the entire slab as one piece, you're usually getting more material than you'll need. With a little foresight, though, you can use this excess in a smart way. Leftover stone can be used to cover a backsplash, as a durable finish for the sides of an island, or even as a flooring transition between the kitchen and dining room.
On behalf of the largest countertop manufacturer in the Pittsburgh area I would like to add a few thoughts to this article. It defiantly brings up some great questions to ask who you are working with and what their procedures are. You may find that some of these 12 ways will actually INCREASE your cost. It is always important be cautious of extremely low costs, chances are you aren't comparing apples to apples when it comes to the quality of fabrication.
Restaurant going out of business sales/auctions are a good option too!
Another tip for saving money on counters: go with prefabricated counter pieces. I was able to get marble for my counters and island at a fraction of the cost this way. :)