At Amazon, get this 24" Mobile Home Ground Anchor 4-Pack for $46. It's the best price Amazon has charged for this 4-pack.
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Features Set of 4 spiral ground anchors, each 24" long Powder-coated alloy steel construction Includes an adapter for installing w/ a power drill Can also be turned into the ground by hand Suited for sheds, trampolines, swings, tents, and mobile homes 1-year manufacturer warranty