I ordered a 5 quart bottle of Pennzoil Ultra Platinum 0W20 from Amazon on May 17. It was back-ordered and finally delivered on June 14th. I've only seen PUP for sale at my local Walmart years ago when it first came out. I buy a bottle every time they have the 10% off sale on Amazon. I can't find it anywhere cheaper. Its either in low supply or high demand. Our local Walmarts have a ton of Castrol oil. I always thought it was because their headquarter are a few miles away.