Walmart continues to offer Mobil 1 Synthetic 5-Quart Motor Oil or Mobil Super 5-Quart Oil in 23 varieties from $7.17 after this mail-in rebate. (The starting price and rebate amount vary based on the type of oil you buy.) Opt for in-store pickup to avoid the $4.97 shipping fee. That's tied with our May mention as the lowest price we've seen for any Mobil 5-quart oil. Rebate ends October 31.

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Note: Although Walmart is not specified on the rebate, customer service states that this list is not all-inclusive, as it reads "some participating retailers".