Walmart has Mobil 1 fully synthetic motor oil on sale for $10.88 after Rebate
Other weight is also available.
5W-20
0W-40
10W-30
This price is lower than previous front page deal
Edit: This is what I did. Ordered two for free shipping and the rebate allows max 2 per household. There is no need to deal with Walmart store pick up if you prefer.