Try my local CarQuest store, and see if they'll ship them to you. They've been a HUGE help with my '62 Suburban, especially with brakes. Wheel cylinders on the shelf (1-inch bore; 1 1/8-inch bore was a day away) shoes on the shelf, and I just called them yesterday to see if they could get me some rear drums, and they not only could, they had them ON THE SHELF!
Best of all, while LMC lists them online for $45 each, CarQuest has them for $25 each.
(706) 367-5000.
Ask for Greg, and tell him Brad with the '62 Suburban sent you.
-Brad