Autozone has Idemitsu full synthetic 5W-30 or 0W-20 motor oil for $5 in store only (where stock is available). You can see it online but it won't show as available or allow you to order online. Must go and see if you location has stock.
This was previously posted but at $10. Looks like they were not able to sell enough of it because the price got slashed again.
Idemitsu is a Japanese Oil maker that supplies OEM oil for Subaru engines, although the oil can be used in most vehicles that can use full synthetic.