Amazon acquired that facet of its business, and should not be considered a B2B product.
Most general purpose robot firms just don't do well domestically, and rarely make it past a business cycle. I would partner with Festo Germany before touching US markets. =3
Most general purpose robot firms don't do well at all, because until very recently, general purpose robotics have fallen short of being useful in general purpose scenarios. Amazon acquired Kiva 13 years ago. Kiva was itself founded and headquartered in the U.S.
My point was robotics startups don't typically survive with generic products very long. They are acquired or go under even after they reach TRL launch stage.