It would probably be cheaper to call for a concrete business to deliver however many yards of concrete you need in a concrete truck, if they're willing to deliver a small load.
HOW MANY BAGS OF CEMENT IS NEEDED FOR 1 10x14 4 INCHES THICK?
If you are talking about a 10x14 foot x4 inch slab, you'll need approx:
156- 40lb bags
125- 50lb bags
104- 60lb bags
or
79- 80lb bags