NEVER BUY OIL AT AUTOZONE. Go to wally world!
Don't buy oil at AZ for the regular price.
Wait for a "Buy 5qt get a filter" sale, and the package deal is competitive with Wal-Mart. In fact, sometimes it is better. Sometimes for $33 I would get Castrol black edge with a K&N oil filter. For $36, I could get Castrol gold edge and a K&N oil filter.
Autozone might have such a sale in the future that includes Pennzoil Ultra. In that case, I think they would charge $36 for the package deal.