Patrick: I buy my GL-4 from Napa or Amazon. If I need it now, I get it from Napa. If I can wait a couple of days, I get it from Amazon. It's the Sta-Lube brand, and I get it in the gallon size.
That stuff is jacking up in price. I bought some back in July and it was about $26 for the gallon.I found this last night. NAPA closed all of there local stores here. We used to have a hub less than a mile from my house too.