Walmart offers a selection of Pennzoil Platinum Full Synthetic Motor Oil, with prices starting from $4.28. (Amazon charges about the same for many of these items.) Redeem this rebate to cut starting prices to $2.28. (This rebate is for $2 off per quart for a maximum of up to $10 per rebate.) Opt for in-store pickup to dodge the $5.99 shipping fee. Deal ends June 30.

Note: There is a limit of two rebates per person.