Walmart DOES work for this rebate, I already received mine, one for $17 and one for $12 and everything was bought at Walmart, rebate has been going on since April. They give these odd "e-check where you basically print out a check and can take it to the bank or electronically deposit it.
https://slickdeals.net/f/12986812-mobil-1-motor-oil-and-filter-rebates-up-to-17-off?attrsrc=Test%3AHideExpiredSearch%3AHide%20Expi red&src=SiteSearchV2Algo1