Well, assuming you are looking for 1/350. I've bought L'arsenal guns, it looks like there are one or two others.
Check Freetime Hobbies.
You might also check how many you need. Not that Trumpeter gives them away, but I've been saved a few times where they include a sprue, or multiples of the same one, that cover the needs of a ship in the same class, but a different AA fit.