If its labour, materials and disposal of arisings, I would think its not a bad price as the job would take more than a day to complete waiting for brickwork to set etc.
Is the base for a wooden shed? if it is I wouldn't bother with foundations and brick work just use a timber shutter and a 150mm thick concrete slab, as long as the slab is on reasonable ground it will be fine as there is no weight in the shed,
You could DIY it, you'd need about 1500kg of ballast and a 15 bags of cement mix it up about 4 or 5 to 1 and a bit of timber for the shutter, materials would set you back about a £100.
Or stick down 4 paving slads for the shed corners to sit on one in the middle make sure the are level and job done.
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