I ordered from walmart online to pick up in store. It was $11.49. When I picked it up in the store today the box surprisingly came with a sticker for $5 rebate.
https://apfco.com/secure/r9519w/

I followed the directions and filled out the rebate form. It asks for a picture of original cashier receipt. When you order walmart online, the in store receipt they give doesn't show the price.

2 out of the 4 retailers shown are Amazon and Pep Boys. I dont' remember the other two. I clicked on "other". I don't know if Walmart is a participating retailer.

After I went on Amazon it's listed the same price there as Walmart.

Hopefully it'll work for me
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96 fleetwood 63k dd- MaxLife 5w30, AC Delco pf52
95 Caprice 67k LT1 dd- Shell Rotella T4 10w30, same ^
84 Caprice Landau 14k- MS5K 5w30, AC D pf454
96 Buick Roadmaster 65k- RIP 17
00 Town Car- RIP 16