Amazon has the case of Redline 5w30 listed twice on their site. One listing is $119.40 and this link has it for $110.44. I ordered a case yesterday, plus it comes directly from Amazon so I got free shipping with my Amazon prime account. Note, it says a quart, but its a case of 12 quarts. On my account, it says 'Red Line 5W30 Synthetic Oil - 1 Quart, Pack of 12'. That's the best deal I could find on this oil after looking all over.
Amazon.com: Red Line 5W30 Synthetic Oil - 1 Quart: Automotive