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I find old harddrives and rip the magnets out of them. I use them to hold down windshield covers when it snows. So far only 40mph+ gusts have been able to "move" the magnets. I've never had the cover fly off. Even the small flat ones work well, but I prefer the thicker beefy ones.
If all else fails, order up some rare earth magnets from a website. $3-5 for ones strong enough to hold just about anything you'd need down.
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