The onagofly drone is not available yet. CNET said it would be available in March for $200 but that did not happen.
A manufacturer makes thousands or more of a product so they buy the parts in huge quantities at very low prices. If you make only one or two then its parts will cost a fortune.
the manufacturer probably made a number of prototypes before the design was completed but you will have only one prototype with problems that will need another few designs and prototypes built to fix.
My drone cost $25.00 and has 6 axis gyroscopes. It can flip or roll. When it wears out or breaks then I will throw it away and buy another one.