I've never seen Chevron Supreme in my neck of the woods. Havoline, on the other hand, is USUALLY available in every corner market and drug store. Last week, Chevron Supreme in 10W-40 suddenly appears on the shelf of my local WM. No other weight... just 10W-40. Then, I notice that Sam's Club is stocking CS in 20W-50. Again... no other weights. Havoline supplies, however, continue to dwindle. I'm not sure why Advance Auto even bothers putting the stuff on sale anymore... it's never in stock. I'm assuming this is a Katrina-related supply issue. Anybody else notice quirks in their local oil supplies?