If you don't mind paper cases Kranks do them by the 100 ready primed.
They can be reloaded a few times until the crimp mouth goes soft. The thing to watch for with paper cases
is small black burn marks like pinholes where the case meets the head.
If you see them scrap the case as it is on the verge of separating.
You could try clay shoots to find suitable cases,they usually have a problem disposing of them.
I know one shoot that has two jumbo bags spilling over with fired cases.