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To cover the entire grilling surface with GrillGrates would cost somewhere in the $100 range. Keep in mind GrillGrates are made of hard anodized aluminum and should last a very long time. You could always just cover half of the grill for half the cost.

You can get GrillGrates online at their store http://www.mygrillgrate.com/ Competition teams are using them on the circuit with winning results

GrillGrates sells three different sized kits designed for the Weber Kettle. The outside grates are radius cut in order to fit the round grills. The kit for the 18.5 kettle would fit nicely especially if you add an additional center panel giving you 21" of coverage.