King Arthur 家的两款产品购买后提交收据，即可获得 100% 返现，实现免费。
产品一：Baking Sugar Alternative
官方明确说明了 Amazon 也符合要求，返现接收方式可选 PayPal 或 Venmo。
另外，第二款产品 Pancake Mix 在 ibotta 还有 $1.5 返现，但不支持 Amazon，需要到店里购买。
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