The USA had several Thin Mans and considered converting every one Thin Man into 8 Fat Mans. Was that true, still classified or false? I know a lot about the nuclear weapon programs, but I don't know that.
No, on 10 AUG 1945, the stock of atomic weapons was 0. But, as Amazon says, more coming! The next target was Tokyo. Truman had drafted a letter to Churchill explaining his decision, which Churchill opposed. It was our lads who were dying at the rate of about 200 a week in the Summer of 1945, many to Kamikazes. Chinese, and people in other occupied territories were being slaughtered at even a greater rate.
The kamikazes probably did more to influence the decision to drop the bomb than Pearl Harbor. The Japanese wanted to convince the U.S. that conquering the home islands would be ghastly. The U.S. wanted to convince the Japanese that it would be even more ghastly than they had imagined.