I've also heard rumors that Suzue went out of business, although I'm not sure on it.
That said, your LBS also probably has a big box of assorted cones and can look through to find something which matches the curvature of the cone that you're replacing.
This may be more tricky if the cones have integrated dustcaps - I've got a Suzue flip-flop hub with loose bearings, that has the dustcaps fixed to the cones, not pressed into the hub shell. Here
's a picture of that hub.
Here's a picture of a trashed cone
(from a completely different hub - it's just impressively pitted).