Here is a YouTube video of a clever little robot made by students at the University of California in San Diego. Robots of this level of complexity are being made at universities all over the world these days.
New kits are coming out on a regular basis. It is getting easier and cheaper to design and build robots from kits.
Midway through the video, however, the narrator announces that this robot was fabricated using a 3-D printer. Just a few years ago, it would have cost $50,000 to make the mold to produce the main body of the robot.
What this video demonstrates is that it is now getting easier and cheaper to build custom robots that go far beyond the capabilities of what is available in the standard kit.
All that is needed is a bit of thinking outside the box the kit came in.