i tried to look for the stuff in Home Depot too, but couldn't find it in the right pattern,.... I wanted a more horizontal rhombus shaped pattern but all they had was a vertical shaped one.
but I found something that looked like it might work at OSH, rain gutter guard, comes in a role about 8 inch wide... comes in vinyl and alumnium....
got the vinyl one so the cut edges wouldn't scrape the paint.