1967 coronet rear drums???? 11x2 1/2

I have a 67 coronet wagon 383 car with the 11x2 1/2 rear drums, does anyone know of a good source for these drums, as I checked a few places and it looks like they are not available anymore, in 67 they were smooth and in 1970 they went to the finned ones which are available, but still a bit pricey, I found parts master ones at $90.00 list each for the finned 70 style.
Thanks.

An alternative for you,
my car apparently had the rear end changed out in its lifetime and had 10" rear drums on it.. It is an RT and should have come with the 11"...

I decided to run them and they have worked fine for 7 years.

Unless you are looking for a resto original look I bet the plain drums fit just fine. Rockauto has them for cheap. $42 for Raybestos, 70 Coronet.