Why is it $75.00 more for tannedcape, a tannery will tan a salted cape for $28-$35? You would be better off to learn how to tan the capes yourself. You would already have to thin the hide as much as if it would be tanned anyway if you are going to use DP.
If you tanned yourself you would still have control over your completion times. And you will end up with a far superior product. You will have a piece of leather instead of a dried up piece of skin. Your skin is going to stay where you put it instead of pulling and moving as it dries hard.
Just my thoughts. If i was going to spend my money on something i would hope that it will look as good years down the road as the day i picked it up.