I 99.9% sure the one from Jantz is going to be stainless. Don't know anything about the Ancient Arms one, except that the price and the look of the pattern suggest Indian manufacture (just a guess). There are always lots of auctions at fleabay for damascus blade blanks from Pakistan or India. You could probably find numerous tanto blanks by going that route. As for pure carbon steel tanto blanks, I don't know of any. You used to be able to find Cold Steel Carbon V blanks (including their tantos) at the auction place, as well, but I think they've dried up.