Where can I buy more of this Japanese mochi chocolate snack in NYC?

Hey everyone! I’m trying to find Omochi no Hitotoki (おもちのひととき) by Bourbon — specifically the chocolate flavor (Chocolat ショコラ) — in NYC. I’ve had it before and I’m obsessed. It’s that super soft mochi with a rich chocolate filling (pic attached).

I already tried checking Sunrise Mart, Mitsuwa, and a few other Japanese/Asian grocery stores, but no luck so far. Has anyone seen it recently anywhere in NYC, or know a shop that reliably stocks it?

Alternatively, if anyone knows a legit online store that ships this to the U.S., I’d appreciate the recommendation.

Thanks so much!!