Tamarack Solar has several inexpensive ground mount component kits. They give you all the fittings and clamps, but you need to source the Schedule 40 galvanized pipe. Unirac, IronRidge, and K2, all have pre-engineered ground mounts with plans you can download for permits.
Honestly, they are practically the same price as wood and a lot less labor, IMO. Either way, if you are buying lumber capable of withstanding 110 mph winds, as I have in my backyard, I estimated the cost of using wood for 10 panels to be between $100 - $150 per solar panel. I used the big 400W, 72/144 Cell panels. I haven't found a way to do it cheaper, except ballasted flat-roof/ground mount with a 5 to 10 deg tilt. It's a cheap and easy DIY project. I did this one myself. I just needed help moving the panels in place because they're longer than I am tall. Just remember to put down the weed barrier "first".
You can also build a floating deck and use an attached tilt-up system by K2. You can hide the ballast blocks under the deck and it doesn't even require footings. In NC, if it's less than 30" tall, and not attached to the house the deck doesn't require a building permit.
One more idea I had. Use metal roofing panels and build a galvanized, or aluminum metal roof on the ground. Attach a tilt-up system like K2 using S-5! Clamps to clamp onto the standing seam, or just bolt the L-foot to the metal roofing. Then stack ballast blocks and gravel to cover up the metal. It'll look good!
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