Shed foundation? What is the best and least expensive approach to dig a foundation...

What is the best and least expensive approach to dig a foundation for a 10x10 shed. It is already on a pressure treated floor gear consisting of 2x4's. I was thinking of framing a 12x12 nouns with 4x4's and wadding in to rank with 3/4 inch stone. The low side of the site is in the region of 12 inches below "level" ground. Any suggestions???
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Answers:    That would work, it would give you suitable drainage and a good solid surface to stand on. You may want to find something cheaper than 4x4's, perchance railroad ties or even pressure treated 2x12x12 if you are going to back stuff it with pea stone you shouldnt hold a problem with them bowing contained by.
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Use three 4x4's as carrying beams plumb to the floor framing. Place one in the middle and one on respectively end 2 foot in from the come to an end of the building. Use concrete blocks as a weight pose point on each 4x4 spaced a foot contained by on each shutting and divide the distance for the middle bearing points. If you are within a cold weather climate use sonatubes dug below the frost line.