Guild Wars 2

I have google searched my buns off and cannot figure out how to get or craft a Superior Sigil Of Battle, short of buying one off the trading post or getting lucky enough to get a drop and salvaging it from a weapon.

Am I missing something or is that pretty much the only two ways?

If it’s not craftable then it has to come from a drop.
Well there IS another option but it is probably not any cheaper.
You can toss in 4 rare sigils into the Mystic Forge.