Squaregrouper
Kragaphile
Remington recently did their annual run of .30-40 Krag ammo and it is readily available across the country. If you're looking for some, I would buy it within the next week or so because it will become virtual unobtanium from December to October.
https://ammoseek.com/ammo/30-40-krag
https://ammoseek.com/ammo/30-40-krag