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They are probably not many... If any to be found. They really only exist in countries like Mexico and some places in Europe where having a firearm chambered in military calibres is prohibited. Highly doubt you would find one here unfortunately. Being Leo only in the states would probably make it impossible for a glock distributer like questar to bring them in with legal barrels.
Try European dealers - it's easier to import from Europe anyway - and try Storm Lake for a barrel - they might be able to simply chamber a 9mm barrel for 380.
Personally I would stick with 9mm. Even the Norinco .380 runs $20 a box. I like the caliber, (and have 12/6), it's just expensive to shoot and I don't shoot enough to start reloading for it. My personal fav is my Browning BDA .380 (made by Beretta)