FWIW, last week I picked up a case of Shell ATF 134 at a Shell distributor in Dayton, OH. I was headed from Michigan to Hopkinsville, KY (near home) so I started calling Shell distributors that I got off Shell's Distributor Locator Website along the way. The distributor in Sydney (Hi-Grade) was out of the ATF 134 (but said if he had some it would be $62 a case, and could have more in 2 days), but he gave me the number of two distributors in Dayton to call. I called the first one he gave me, Mays-Shedd Sales. (The other one he gave me was Englefield Oil. They have several locations in Ohio - Columbus, Dayton, Akron, Newark, several.) They had one case left. It was $62.13 for the case ($5.17 a quart).
The folks at Mays-Shedd were great. When I called them at 3:30 I was still well over an hour away, and they closed at 4:30, but they said they'd wait for me until I got there, which was just before 5:00. I thought that was pretty awesome. They already had it brought up into the office from the warehouse and it was sitting by the door. They took my credit card and I was on my way. They, too, can get whatever you need in a day or two if they don't have it in stock.
Of course, Sayle Oil in Memphis next door to the twin Pilots on Lamar almost always has several cases in stock. I think they're in the low $60 range, as well.
Just another source or two to keep in mind for this stuff.