Yeah, I couldn't believe how expensive the oil was on the shelf. $39.99 for a 5 quart jug of Valvoline SynPower 5W30 from 2016. After a sale, online purchase discount and 2 rebates it got my price down to $10.98 for the jug, which works for me.

I don't know who would pay full prices there when Walmart (or even Amazon) sell oil so much cheaper.