I can not find “quadrotor x tailsitter” airframe in the market

PX4 Autopilot VTOL 🚁
1

Pixhawk clearly supports this airframe，but I can not find it in the market.

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If anyone could help me, I would really appreciate it!

2

I can find this kind of UAV,but not the airframe.
I want to find an airframe to assemble my own UAV.