Not sure if this is really a good deal or not but AutoZone has a package deal where you get 5 qts of Castrol Syntec Synthetic oil and a Bosch Oil Filter for $24.99.

Last I checked, Walmart was selling Mobil 1 Synthetic for about $24 so I guess its like getting an oil filter for free.

Disclaimer: I have no idea how Castrol Synthetic and Bosch filters compare against Mobil 1 Synthetic and Subaru OEM filters. I guess I'll find out shortly...