We pay for concrete by the yard. In our area right now (March08 - northeast GA) it's running approximately $99/yd.
Call a few concrete places in your area, they will probably come to your house and give you a free estimate or be able to tell you over the phone when you give them your dimensions.
Mine, just about that size, cost about $3,000. We knew the mason and paid for the concrete directly and paid the mason separately for his labor. Of course where you live will make a difference in the price of things.
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