We work with MoYu and use their MeiLong cube. The primary difference is that we receive the cube in pieces, assemble them in the USA and pre-lubricate them which helps maintain a better quality control.
We manufacture our SCS Speed Cube Pro to distribute it to mass markets, the same as the "Nex Cube," if you have encountered it. However, the existing packaging for nearly every speed cube is not compliant with our distribution channels and most local import laws, so we had to make our own packaging and procure testing and certification to allow a seamless import/export of this item while also adhering to retail regulations.
When we account for fees charged by other platforms such as Amazon, and USA labor rates to assemble the products, we make about the same or less as we would selling a standard cube directly through our website.