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The cost? $119.95 at Amazon:
I think that I'll stick with my method for this household's Weber charcoal grill: a ball of aluminum foil as a grill-surface scrubber. Rub vigorously along both sides of the grill grate, then toss the ball of aluminum foil into the trash. Done!
Commenters, if you have a favorite grilling recipe, please consider sharing it with us. Summer is for grilling!