I recently installed 1380 watts in ground mounted racking. I endeavoured to design a low cost racking system.
The cost of the panels is $0.87 / watt, after the 30% rebate. The cost of the hardware is about $0.25 / watt.
The panels are Canadian Solar - CS6P-230P. The panels and Enphase microinverters are mounted in frames by California Edison.
The labor is whatever you charge per hour. I installed the array in 16 hours.
Some of the hardware is from from Home Depot. The pipe from a pipe supplier. The plans spell out what to do.
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