Amazon offers Prime members the Mr. Bar-B-Q 18" Cast Iron Wok, model no. 06106X, for $15.99 with free shipping. (Non-members can spend $35 or more to qualify for free shipping; otherwise, shipping costs $11.67.) That's the lowest total price we could find by $7. It can be used on a standard cooktop or on the grill.

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Note: Expect shipping to take up to four weeks.